Move GLES20 source into standard locations Move Khronos headers into their respective components, to be exported by each. Remove hostthreadadapter as nothing outside of the vghwapiwrapper, which now contains the code, needs it

@ECHO OFF
mkdir build_vs2008
cd build_vs2008
cmake -DUSE_MINI_EGL:Bool=OFF -DPLATSIM_EXTENSIONS:Bool=OFF %* -G "Visual Studio 9 2008" ..
cd ..