The actor was a special "monster" used für simulating NPC. It was never
fully implemented and therefor disfunctional. Thus it was never used in
any map. Remove it like done in baseq2 and xatrix.
With this commit the game logic is cleaned up. Coop spawnpoint cleanup
is still missing, it'll be done at a later time. While not completely
finshed, rogue should alread run much more stable than the unmodified
code. Please note, that this is still untested! Headers are next,
monsters will be done after that.
