Use dummy player in cutscenes on singleplayer levels.

[DreamyCecil]

GlobalController should create its own Player class on SP maps that will be used for cutscenes.

When the cutscene is triggered, the dummy actor teleports to the spot of a player that triggered it and that dummy actor becomes a cutscene actor, copying the appearance of whoever triggered the cutscene, while real players wait in the dummy state until the cutscene is finished, where everyone teleports back to the dummy actor and it teleports away.

This is needed so the cutscenes can't be broken or softlocked if something happens to the actor (if they leave the server) in which case the cutscene can't be progressed any further.