Added more #defines into D3RTDirectX.h so engine programmers have more access to it's data.

Signed-off-by: dadamitskiy <dadamitskiy@fullsail.edu>
Added a module interface and a Float16.h into the math library. Updated TODOs on math library as per MSDN, and #defined all globals from DirectXMath.h into D3RTDirectX.h.

Signed-off-by: dadamitskiy <dadamitskiy@fullsail.edu>