Added the Thumper

now that we have sandworms https://github.com/OpenRA/OpenRA/pull/6821 and merged medic and engineer into a new support infantry.
It breaks actor targeting and any state that isn't explicitly carried over, and means that you need to add weird workarounds like the `LoopedSound` trait instead of having that tied to an explicit effect.

A much better implementation of this would be to generalize the M.A.D. tank deployment, and have the thump weapon use a warhead that searches for nearby worms and makes them move towards the area.