Create More Comprehensive Particle System

[secretrobotron]

Particle system framework should be as such:

• particleSystems have several base types
• creating a particleSystem will create corresponding particleEmitters
• emitters will create particles in accordance with their particleSystem's emission policy (buckets/linked-lists)
• update() runs particle update function, updates particle array
• draw() only draws particle array (no updates)

[cjcliffe]

particleEmitter has been temporarily pulled while I work on resolving the ParticleSystem structure