Particle System Support

[dkonik]

Add support for particle system in Nova, including being able to have particle systems clipped by ClipMask, color tinted, etc.

Moved from another discussion.

[jamesyoung79]

This would be great! As it stand now particles can be done by mixing in non nova elements with a scaled up sprite mask, however Nova UI doesn't seem to play well with the render order of them. Also, using Clip mask would be HIGHLY preferred especially if it would prevent stuff from spilling onto other UIBlocks.