added that, removed r_waylandcompat (it never worked properly anyway),
so now the window always has an alpha chan, and by default dhewm3 tries
to guess whether it should be made opaque at the end of a frame or not
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.
