Updating 7 large scale wuschel maps

-- updated: RA map POSEIDON - facelift, small tactical changes on middle island.
-- updated: RA map PLUTO - corrected oil derrick that was not capturable.
-- updated: RA map ARTEMIS - some cosmetic changes on main island.
-- updated: RA map ARES - minor yaml changes to MISS.
-- updated: RA map APOLLO - minor yaml changes to MISS.
-- updated: RA map DIONYSUS - cosmetic changes on main island, minor yaml changes to MISS.
-- added: RA map ZEUS, 256x320 (lo and behold, the father of all mapz!)

Note: ZEUS, ARTEMIS and APOLLO need https://github.com/OpenRA/OpenRA/pull/3375 to be implemented in order to avoid lags. The first map (Zeus) is lagging badly, Artemis is faring better, and Apollo is usually slowing down end-game.