Integrate particle system

[cb341]

Implement generic particle emitter plugin.

Todo:

• Define components
• Define systems
• Define resources (for assets mayhaps?)
• Find a way to render sprites
• Benchmark

Components

Particle Emitter

• Speed

Particle

• Remaining lifetime
• Position
• Velocity
• Type?

Textures

• Block textures

Animations? (optional)

• Tween

Systems

• summon particle emitter?
• update particles