Add mapping fix to guestegl and debugging (temporary)

Replace file copyright headers lost in previous merge.

Merge in eglQueryString changes

Host components now buildable in their correct locations (although stil using CMake). Use build.bat in package root. Note holdingarea build no longer works and everything except llvm will be removed soon. Fix ups to references to components moved to vghwinterface. Move package common headers up to pacakge level inc directory.

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

Remove copies of code made accidentally to the wrong location.

Copy code from the holdingarea into the target locations. Some initial rework of CMakeLists.txt files, but not yet tested.

Modify bug235.pkgdef.xml in line with changes to package_definition.xml Add license details to host support components.

Rearrange the package to put certain components into a new collection, vghwinterface. Remove unpopulated syborggraphicswrapper, as it will be integrated into the vghwapiwrapper (ne khronosapiwrapper).

Add support for eglQueryString. Its partially fake support because the serialization interface does not support the return of string data