Simplification of `ParticleBuffer.CopyTo` method.
Range types now have implicit conversion from primitives.
Added FastFade capability to PointSpriteRenderer (FastFadeModifier on the GPU).
Added `ColourInterpolator2` modifier.
Added new constructor for `LinearGravityModifier`.
Sample application is now self calibrating. Automatically increases particles account to the maximum number that can be sustained at 60Hz.