Zone Wars

[Admins]

We need to balance Zone Wars a little bit more:
- eventually make the flame bombs less strong
- eventually disallow jetpacks near the power stations
- add some more ways to stop or overtake mechs? e.g. throw a grenade at the mech and then the driver is thrown out
- eventually reuse the lava cave, e.g. when the dark side wins then everyone is put into the lava cave and there is a final round (last-man-standing), only melee weapons allowed