Bot Vehicles not team-only

Quote from YourBuddyBill: {{{ There's a problem with slayer, when team vehicle spawns are used to spawn some types of bots (the ones that are not in the vehicle list), anyone can use them on either team. This is obvious in Heed's Buildland 4 TDM, where a number of reds got into the turrets outside blue base and just spammed them at blue's front door. Could you look into this? }}}

Change the vehicle detection method. Also, add some kind of isVehicle function.