CircleParticleEmitter: This particle emitter subtype will allow particles
to spawn within any area of a circle opposed to just the outlining edge in the
CircleOutlineParticleEmitter object. The CircleParticleEmitterobject requires the same parameters in its constructor as the CircleOutlineParticleEmitterobject. To test this particle emitter subtype,simply refactor the object in the CircleOutlineParticleEmitter example touse the CircleParticleEmitter object instead