Add $(ProjectDir) to default include directories.

Author: nitrocaster

src/Common.props

@@ -28,7 +28,7 @@
   </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
-      <AdditionalIncludeDirectories>$(SolutionDir);$(xrSdkDir)include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(SolutionDir);$(ProjectDir);$(xrSdkDir)include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <AdditionalLibraryDirectories>$(xrSdkDir)libraries;$(xrLibDir);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>