Shot color

Shots now have the color of PsyChObALL. The weird rainbow-effects that
happened when you shot at the wall bothered me.
Code refactoring

Using vartimers to change variables and replaced the kk and jj from
menu.
Next on list:
- refactoring ii
- refactoring the whole main.lua, it is becoming too big and hard to
read (starting in draw())