new feature: g_tourney

new feature: g_tourney
- splits the game into warmup and match stage
- After a new map is loaded the game is automatically in warmup-stage. Players are able to get from warmup- to match-stage by reading up. During warmup-stage the players automatically have all weapons (with appropriate ammo) and much health and armor. The amount of health, armor and ammunition is defined in the g_tourney_start_xxxx variables. However, the map also has all the items like health, ammo and weapons that can be picked up.
- spectator chat can be limited so that only specs can talk to each other, so players won't be disturbed during the match
- admin can forbid spectators to call a vote

git-svn-id: svn://svn.icculus.org/nexuiz/trunk@3657 f962a42d-fe04-0410-a3ab-8c8b0445ebaa