Spaceman2028 Cup 3.5

Whoops. Seems something went wrong with the PK3 and maps started crashing the game when loaded. I have since converted the map pack to a WAD file, and it seems to run just fine now.

Adding a hotfix that greatly reduces the number of spectators in Thunder Park, as I noticed that having too many causes lag in highly populated net games.

I have now made a second map, which means that Spaceman2028 Cup has now been upgraded from a single map to a proper map pack.

Changelog:
~New Map: Thunder Park! Straight out of Hydro Thunder, this simplistic arena's small size will no doubt lead to some close-quarters tomfoolery.
~Tsukuba Circuit has been updated with a new skybox, new music, and a rather stormy Encore palette to reference Tsukuba Circuit WET Race, the rainy version of the track seen in Gran Turismo 4.