Coop Play
Coop play works now, including coop savegames. I also
fixed the savegame problems when under doors or on lifts.
We still have some game issues we need to hack around to
allow coop to be played all the way through the game
(like needing to pick up multiple power cubes, but still
leave them for other coop players to grab), and the monster
ai needs a bit of work for multiple players, but it will
all be there for the next release.