Working on physics contacts. Not working for some reason..
Adds ambulance sirens, hospital

TODO: Start extending the patient class to support multiple patients and spawns. We need to store the current patient if the player has picked one up - maybe store a reference to it in the ambulance class?
Extends Character class with a patient object; adds logic to only load a patient if the ambulance is empty.

Adds initial class object for Score.
Implements basic Score class.

TODO: Hook up scoring. Score class should be an observer that can receive notifications from objects that want to update the score.
Hooks up basic scoring mechanism
Misc. cleanups
Refactors Score and GameRules class into ScoreKeeper. This will hold all game logic to do with points and scoring. It handles the creation of objects related to points, such as patient severity ratings. It also implements classes for handling game events like delivering a patient, having a patient die while en-route, etc.

This class will be completely decoupled from any other class, so any data that it needs to process scores should be passed into the methods.
Implements basic patient-delivery scoring. OK to merge.
Add dynamic texture loading for patient based on severity level
Adds a score label. Add it from ScoreKeeper.

ScoreKeeper can also keep the other labels, like fuel, supplies, etc.