make build process saner (emit binaries into root rather than spray them through /bin/Debug/)

OpenRA.Gl/OpenRA.Gl.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=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -17,7 +17,7 @@
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
-    <OutputPath>bin\Debug\</OutputPath>
+    <OutputPath>..\</OutputPath>
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
@@ -75,6 +75,7 @@
   </Target>
   -->
   <PropertyGroup>
-    <PostBuildEvent>copy "$(TargetPath)" "$(SolutionDir)"</PostBuildEvent>
+    <PostBuildEvent>
+    </PostBuildEvent>
   </PropertyGroup>
 </Project>