Fix VC++ broken build folder structure

buildcpp.xml

  <!-- Add to .vcxproj file after line importing $(VCTargetsPath)\Microsoft.Cpp.props to have sensible build output folders -->
  
  <!-- have VC++ emit build artifacts into \bin and \obj folders like managed proejcts do -->
  
  <PropertyGroup>
    <!--
        The VC++ build scripts automatically appends atrailing slash on OutDir, which annoys some tools,
        so I added OutputDirectory w/o the slash. Also, I'm using "PlatformShortName" so x86 binaries don't
        end up in the "win32" directory
    -->
    <OutputDirectory>$(ProjectDir)\bin\$(PlatformShortName)\$(Configuration)</OutputDirectory>
    <OutDir>$(OutputDirectory)\</OutDir>
    <IntDir>$(ProjectDir)\obj\$(PlatformShortName)\$(Configuration)\</IntDir>
    <!-- for projects that do codegen w/ MIDL, you can generate the files into the GenDir folder -->
    <GenDir>$(ProjectDir)\$(GeneratedFilesDir)$(PlatformShortName)\</GenDir>
  </PropertyGroup>