* add snow demo to vfx particle simulation
* refactor particle simulation into one file
* remove clouds demo link (extraneous)
* init clouds example
* fix wrapping and clumping for clouds at all wind speeds
* move clouds example code to one file
* add vfx particle animation clouds demo
* add vfx particle animation to examples.html
* fix indentation to 2 spaces
* fix merge examples.html
* add snow demo to vfx particle simulation
* refactor particle simulation into one file