UI: comments (removed a FIXME, added a TODO)
UI: fix audio mute image path
UI: bump version to 0.6.2
UI: Add vendored  squarefeet / ShaderParticleEngine js dep

https://github.com/squarefeet/ShaderParticleEngine

Sourced from latest dev branch commit
https://github.com/squarefeet/ShaderParticleEngine/commit/1584fcf8f858ba5f597c1daf12f74e29070f0f31
UI: add particle engine based star dust effect