so mod authors can tell cmake to call it mymod.dll instead of base.dll
or d3xp.dll
and the compiler defines are also easily configurable now
I also added a comment to EndLevel.cpp, which was released with the GPL
source (and in d3xp/ it already existed in the SDK), but has not been
used to build the dlls.
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.
