progs engine no longer refers to any global vars. This alows for multiple progs
being loaded (NOTE: NOT multiple mods, but (eg) for various protocol
extensions) and, once the last couple of issues are taken care of, CSQC.
split up the headerfiles and such. common.[ch] and qwsvdef.h no longer exist. More work still needs to be done (esp for windows) but this should be a major improvement.