AAPT2: Variety of small fixes to get the build working

- Add option to rename package in AndroidManifest.xml
- Support default versionName and versionCode
- Accept True and False as valid booleans

Change-Id: I400e350b9dcd0fd1c197d1929144299c7823617d
diff --git a/tools/aapt2/io/Data.h b/tools/aapt2/io/Data.h
index 9081c55..467e604 100644
--- a/tools/aapt2/io/Data.h
+++ b/tools/aapt2/io/Data.h
@@ -79,6 +79,21 @@
     size_t mSize;
 };
 
+/**
+ * When mmap fails because the file has length 0, we use the EmptyData to simulate data of length 0.
+ */
+class EmptyData : public IData {
+public:
+    const void* data() const override {
+        static const uint8_t d = 0;
+        return &d;
+    }
+
+    size_t size() const override {
+        return 0u;
+    }
+};
+
 } // namespace io
 } // namespace aapt