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.
This has to be `DateTime.Seconds` since we integrated. https://github.com/OpenRA/OpenRA/pull/6807 That is why I wanted you to rebase.