Improve performance drastically by reducing draw calls. Fix #8

[tguerin]

Fix #8

Rain animation before improvement:

• 1 particle, emitDuration 100ms

  

• 30 particle, emitDuration 100ms

  

Rain animation after improvement:

• 1 particle, emitDuration 100ms

  

• 30 particle, emitDuration 100ms

  

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