updated StockShaderCodeGenerator (sscg) to support DX11 shaders
updated the DX11 RenderSystem to be on par with the DX10 RenderSystem (it is currently not working completly because of some issues with shaders)
added information about OperatingSystem and Version to AddInSystemFactory
added IsSupported field to AddIn Creators
AddInSystemFactory now only loads supported AddIns
added Metadata resource files to all AddIns containing information about supported platforms.