it wants to store a pointer to itself in an idWinVar - on 32bit idWinInt
was suitable for that, on 64bit it's not, so instead convert the pointer
to a hex-string and stuff it in a idWinStr
also fix a crash when adding a choiceDef in the gui editor
rvGEWindowWrapper is still TODO - it's not as straightforward, because
it insists on storing a pointer in an idWinVar (using idWinInt), but there
is no idWinVar type for pointers
Editor also seems to start, didn't test much further.
Only tested 32bit Windows, I fear the editor code isn't 64bit clean..
I hope I haven't broken anything elsewhere..
Sys_GetScanTable() and MapKey() are only used by the Windows backend
or the Windows-only tools.
Rename to Win_GetScanTable() and move MapKey() as Win_MapKey() to
win_input.cpp.
Don't include the lazy precompiled.h everywhere, only what's
required for the compilation unit.
platform.h needs to be included instead to provide all essential
defines and types.
All includes use the relative path to the neo or the game
specific root.
Move all idlib related includes from idlib/Lib.h to precompiled.h.
precompiled.h still exists for the MFC stuff in tools/.
Add some missing header guards.
