Revert "Revert "Metadata handling rewrite""

This reverts commit 5e01e2ac977655aa074faf7fde0a74298f5e4c55.
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
index dcb943a..20a47cd 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
@@ -313,6 +313,7 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint_pair.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\error.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\error_internal.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_epoll_linux.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_poll_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_posix.h" />
@@ -365,6 +366,7 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_reader.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_writer.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\percent_encoding.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\slice_hash_table.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\slice_internal.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\slice_string_helpers.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\api_trace.h" />
@@ -378,14 +380,17 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\init.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\lame_client.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\server.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\validate_metadata.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\byte_stream.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\connectivity_state.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\mdstr_hash_table.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\error_utils.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\http2_errors.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\metadata.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\metadata_batch.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\pid_controller.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\service_config.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\static_metadata.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\status_conversion.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\timeout_encoding.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\transport.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\transport_impl.h" />
@@ -402,11 +407,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\hpack_encoder.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\hpack_parser.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\hpack_table.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\http2_errors.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\huffsyms.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\incoming_metadata.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\internal.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\status_conversion.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\stream_map.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\varint.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\alpn\alpn.h" />
@@ -621,6 +624,10 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\slice\slice_buffer.c">
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\slice\slice_hash_table.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\slice\slice_intern.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\slice\slice_string_helpers.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\surface\alarm.c">
@@ -663,7 +670,7 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\connectivity_state.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\mdstr_hash_table.c">
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\error_utils.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\metadata.c">
     </ClCompile>
@@ -675,6 +682,8 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\static_metadata.c">
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\status_conversion.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\timeout_encoding.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\transport.c">
@@ -717,8 +726,6 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\parsing.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\status_conversion.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\stream_lists.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\stream_map.c">
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
index ac84e01..8490ac7 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
@@ -259,6 +259,12 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\slice\slice_buffer.c">
       <Filter>src\core\lib\slice</Filter>
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\slice\slice_hash_table.c">
+      <Filter>src\core\lib\slice</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\slice\slice_intern.c">
+      <Filter>src\core\lib\slice</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\slice\slice_string_helpers.c">
       <Filter>src\core\lib\slice</Filter>
     </ClCompile>
@@ -322,7 +328,7 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\connectivity_state.c">
       <Filter>src\core\lib\transport</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\mdstr_hash_table.c">
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\error_utils.c">
       <Filter>src\core\lib\transport</Filter>
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\metadata.c">
@@ -340,6 +346,9 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\static_metadata.c">
       <Filter>src\core\lib\transport</Filter>
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\status_conversion.c">
+      <Filter>src\core\lib\transport</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\timeout_encoding.c">
       <Filter>src\core\lib\transport</Filter>
     </ClCompile>
@@ -403,9 +412,6 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\parsing.c">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\status_conversion.c">
-      <Filter>src\core\ext\transport\chttp2\transport</Filter>
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\stream_lists.c">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClCompile>
@@ -731,6 +737,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\error.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\error_internal.h">
+      <Filter>src\core\lib\iomgr</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_epoll_linux.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
@@ -887,6 +896,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\percent_encoding.h">
       <Filter>src\core\lib\slice</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\slice_hash_table.h">
+      <Filter>src\core\lib\slice</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\slice_internal.h">
       <Filter>src\core\lib\slice</Filter>
     </ClInclude>
@@ -926,13 +938,19 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\server.h">
       <Filter>src\core\lib\surface</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\validate_metadata.h">
+      <Filter>src\core\lib\surface</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\byte_stream.h">
       <Filter>src\core\lib\transport</Filter>
     </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\connectivity_state.h">
       <Filter>src\core\lib\transport</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\mdstr_hash_table.h">
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\error_utils.h">
+      <Filter>src\core\lib\transport</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\http2_errors.h">
       <Filter>src\core\lib\transport</Filter>
     </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\metadata.h">
@@ -950,6 +968,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\static_metadata.h">
       <Filter>src\core\lib\transport</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\status_conversion.h">
+      <Filter>src\core\lib\transport</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\transport\timeout_encoding.h">
       <Filter>src\core\lib\transport</Filter>
     </ClInclude>
@@ -998,9 +1019,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\hpack_table.h">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\http2_errors.h">
-      <Filter>src\core\ext\transport\chttp2\transport</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\huffsyms.h">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClInclude>
@@ -1010,9 +1028,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\internal.h">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\status_conversion.h">
-      <Filter>src\core\ext\transport\chttp2\transport</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\stream_map.h">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClInclude>