Funpark Take #2

So i finally have something that resembles a working mission, would like peoples opinions and testing. Will need some small changes before its merged.

Unrelated i have some issues with our current TD balancing one of which is that i think the vehicles are too fast, so i may open  a pr for that next.
See https://github.com/OpenRA/OpenRA/blob/bleed/mods/ra/maps/monster-tank-madness/monster-tank-madness.lua#L215 for a way to fix this.