This is the beginning of efforts to reduce the scope of Windows.h. I have
shuttled it into hsWindows.h (again) and fixed the compilation of the
major apps. There is still some scope work that needs to be done, and the
Max plugin has not yet been addressed.
Rearrange some things so such that low-level CoreLib headers aren't quite
so crazy. For higher level stuff, you still need to include the
appropriate header.
