header: Update to version 1.0.67 of the Vulkan hdr

- updated vulkan.h
- updated cgenerator.py
- updated generator.py
- updated reg.py
- updated vk.xml
- updated layer json files
- updated vulkan.hpp
- updated vuid_mapping.py
- updated vk_validation_error_database.txt for spec changes, new VUIDs
- updated vk_validation_error_messages.h

Change-Id: Ifb67cf406aa82bf89e72ccfa4e1320cb3b199656
diff --git a/scripts/generator.py b/scripts/generator.py
index a9a7bd5..c574598 100755
--- a/scripts/generator.py
+++ b/scripts/generator.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3 -i
 #
-# Copyright (c) 2013-2017 The Khronos Group Inc.
+# Copyright (c) 2013-2018 The Khronos Group Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.