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

holdingarea/build_vs200*
holdingarea/bin/
holdingarea/lib/
holdingarea/vg/bin/c_utils.pyc
holdingarea/build/