weapons now have force settings

weapons now have force settings
added g_pickup_* cvars to configure how much ammo, health, armor, each
pickup item gives (and maximum limits on each)
added linear rot/regen settings for health/armor
added physicsQ3.cfg and added more cvars to the other physics*.cfg files
moved weapon and pickup related settings from default.cfg to weapons.cfg
updated the pro mod so that it works and is quite playable
moved minstagib laser secondary fire code to w_nex.qc (still
minstagib-only, just moved the code to a better place)

git-svn-id: svn://svn.icculus.org/nexuiz/trunk@2308 f962a42d-fe04-0410-a3ab-8c8b0445ebaa