Fixed up a bunch of bugs as follows:
- Mines now track who owns them and report when they do damage.
- Turrets now track who owns them and report when they do damage.
- Fixed tone from rocket launcher being played on all players.
- Made terrain beneath turrets invincible so they don't float.
- Fixed some control options not being assigned properly.
- Fixed a bug in CTF where a player never respawned if dying with no other players alive.
- Fixed controls in CTF getting stuck when a player respawns.