Partial Hair Fix file

Issues not fixed:
* Hair polygons are not properly sorted back-to-front which causes artefacts within the hair when viewed from certain angles.
* When multiple characters are on screen, hair geometry often glitches out.
* There are some lighting issues affecting the E3 girl's hair in Slick Willy, likely not a bug in the rendering code, I suspect it's caused by poor light placement in that map. Those lighting issues don't occur in the E3 version of the same map: !z1l4_2-retex.dnf

The patch doesn't fix every single character in the game, only the ones that were correctly set up in the editor with a hair mesh using the M_Hair actor or one of its subclasses like M_HairPhysics. I didn't want to go through and fix every level where a character wasn't set up properly, but this patch lays the ground-work for someone else to do so.

The patch isn't perfect, but it's a big improvement over the unpatched version and hair should at least be visible for most characters with some minor graphical glitches.