PVP Team Compatibility

[sudojunior]

The code currently selects a random player from the connected_players list, without distinguishing between any available teams with players. Especially a problem if it is used in PVP sessions, where players from the same team could be selected consecutively with an evident suspicion of bias.

1. Select one player or x (as in Multi kill #17) players from each player team.
2. Select a random team/force (ensuring the team wasn't selected on the last interval), then select a random player from the team/force.