added \control, \uncontrol, \remove, @removearea, and @give
- \control and \uncontrol toggle control over other player's units
- @removearea removes units in area around mouse
- @give gives units to a player

added unit group permissions function; in general players can only affect units with commands of players of lesser rank
- unitgroup permissions applied when players send chat messages, or specifically in certain commands
- moved engine dependency order; players is now loaded before permissions (had to change default permissions level to 0 rather than a constant)

added player index to color string name helper functions to player.galaxy (since no native to get string color name of a player)
Added spawn count limit (temporary until better spawn throttling is implemented)