Add an option for 3rd person rendering in the options menu

#1

This could be done both ingame or at the main menu. Would make it easier for someone to select 3rd person rendering. If only that was done, @zturtleman…

#2

cg_thirdPerson is forced off on map restart and stuff (possibly because of Team Arena single player end of round orbiting camera). So it would be more than just adding a menu option. I wouldn’t recommend people actually play using third person in a first person shooter.

#3

Well it oughta lead to some more fun trying to figure out where your opponent is… :wink: