start moving common parts of the renderer into OpenRA.Renderer.SdlCommon

OpenRA.Renderer.Cg/OpenRA.Renderer.Cg.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -70,6 +70,10 @@
       <Project>{0DFB103F-2962-400F-8C6D-E2C28CCBA633}</Project>
       <Name>OpenRA.Game</Name>
     </ProjectReference>
+    <ProjectReference Include="..\OpenRA.Renderer.SdlCommon\OpenRA.Renderer.SdlCommon.csproj">
+      <Project>{52FD9F0B-B209-4ED7-8A32-AC8033363263}</Project>
+      <Name>OpenRA.Renderer.SdlCommon</Name>
+    </ProjectReference>
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.