WIP
- Updating createWorld to spawn patients with random severity
- In ScoreKeeper, want to create a method to return a random patient severity. To do this, I’ll have to make each PatientSeverity a class instead of a struct.

TODO:
- PatientSeverity becomes a class instead of a struct, so we can randomly select from them
	see http://www.koboldtouch.com/display/IDCAR/Use+Classes+Instead+of+Structs