Initial implementation of firework class

New algorithm: no framebuffer effects, instead each firework draws
itself and has dynamic velocity position and color.

Firework class implemented, now need to hook up to constructors based on
pointer motion.
Adjustments

Doesn't work ATM...
Works OK now

Playing around with all the parameters a lot...
Merge pull request #1 from 13thsymphony/per-firework-control

Per firework control