Get rid of duplicate code in cgame and q3_ui/ui

[zturtleman]

Getting rid of duplicate code reducing memory usage and makes it easier to modify.

There are minor drawing functions could remove, and larger stuff like duplicated player animations.cfg loading. I'd like to have a single function for loading player model (lower, upper, head) too, we'll see how that goes.

I'll find out if this is a bad idea later when porting games over...