Bugfixes

- Fixed the issue when you bought items, then died, then started a new game... player would start with those items *tsk* ;)

- Some of the sounds weren't playing because I was passing the wrong parameter... copy / paste is bad sometimes ;) I knew something was wrong with the previous version

- Adjusted the floor tiles to fit within the 16 colour limit. I was unaware that semi-transparency wasn't allowed

- The screamer was meant to move then wait, then move, then wait, etc. I messed up with the timer which made it move, move, move...

- The screamer slice now updates the player health when collected

- Some small pathfinding fixes with the Skull enemy