attempts at getting music to play.
Music switch works
Cross fading music and credits button are a go
Working credits, new actors and procedural difficulty
Merge branch 'master' into worldMusic

Conflicts:
	DreamStateMachine/Game/World/WorldManager.cs
Added unlockable doors and prop physics
Changed ordering of physics collision handling
Buttons position is now proportional to screen size and sounds stop on new game state
Added Potions that restore the players health.
Currently the potions spawn in hallways and sometimes spawn on top of doors, because I'm not quite sure how to spawn them in the middle of a room.
Merge pull request #32 from mitjmcc/master

Added Potions that restore the players health.
Actors damage now scales with damage factor.
Merge branch 'master' of https://github.com/connorclockwise/DreamStateMachine
Healthbars are now maintained through levels.
Merge branch 'master' of https://github.com/connorclockwise/DreamStateMachine

Conflicts:
	DreamStateMachine/Game/Rendering/Camera.cs