added ctf and domination map support (uses g_ctf and g_domination cvars currently...

added ctf and domination map support (uses g_ctf and g_domination cvars currently), untested however
changed crouch aliases (and code) from using impulses 97 and 98 to using +button5/-button5, this will improve packet loss behavior
crouch now does setsize (as it was supposed to from the beginning), so you can now crawl around in shorter areas of a level, and can duck bullets
data/maplist.cfg support rewritten by Black to go with his new menu, it rewrites maplist.cfg on each level change (just to support repeating a level in the list)

git-svn-id: svn://svn.icculus.org/nexuiz/trunk@337 f962a42d-fe04-0410-a3ab-8c8b0445ebaa