Allow optional import of game specific build props

Author: devo1929

.gitignore

@@ -413,4 +413,7 @@ Icon?
 # Dolphin
 .directory
 
-.idea/
+.idea/
+
+# Game specific build prop files
+Directory.Build.Game.*.props

Directory.Build.props

@@ -11,6 +11,9 @@
   <Import Project="$(MSBuildThisFileDirectory)build\VSCompatibleLayer.props" Condition="'$(BuildingInsideVisualStudio)' == 'True'" />
   <Import Project="$(MSBuildThisFileDirectory)build\Framework.props" />
 
+  <!-- Allow a game specific build prop file to be imported, if available -->
+  <Import Project="$(MSBuildThisFileDirectory)Directory.Build.Game.$(Game).props" Condition="Exists('$(MSBuildThisFileDirectory)Directory.Build.Game.$(Game).props')"/>
+
   <!-- Visual Studio -->
   <PropertyGroup Condition="'$(BuildingInsideVisualStudio)' == 'True'">
     <OutputPath Condition="'$(_OutputConfiguration)' != ''">$(BaseOutputPath)bin\$(_OutputConfiguration)\$(Game)\$(Engine)\</OutputPath>
@@ -27,4 +30,4 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
   </ItemGroup>
-</Project>
+</Project>