Separate particles from entities

[ExE-Boss]

Right now the fact that particles are only client-side entities causes issues and is confusing.
By creating Particle, ParticleFactory, ParticleManager and ParticleSource classes we would fix that.

• ParticleFactory would be the factory for Particle implementations.
• Particle would be the actual implementation.
• ParticleSource would be a component you add to your ComponentProviders to spawn particles when desired. (would extend Updater)
  It would keep a reference to particle factories, the delay timers for each factory and where to spawn the particles created by those factories.
• ParticleManager would be the manager for registering particles.