Added shape despawning to improve performance

Fixed being able to re-unlock locked shop items

Always create and set new character on respawn
Removed unnecessary character creation code when loading plot

Potential fix for duplicate characters
Removed some dev commands

Balanced propellers and actually fixed resistance
Fixed some 'plot not loading properly' bugs

Undone 'fixed' propeller code

Added working propeller resistance

Removed broken propeller resistance

Removed un-used terrain tiles

Removed FMOD project and audiobank files