This directory holds various header files :

mgs.hpp is the MGS API header. If you wish to use the mgs.dll from
your own softwares, you should include this one.
registry.hpp is another header needed by MGS. It holds the registry
entries for mgswin and mgsplugin.
qhull.h is the header for QHull library.

qerplugin.h & qertypes.h are the headers needed to write radiant
plugins. These are the headers for Version 1.00 of Radiant plugins
