Added L4D1 model variant. (Might create something new for said variant later?)
Added compatibility for enabling low-shader version via Workshop.

-Updated textures for better quality.
-Versus-related HUD added.

-Death face should now only play once after killing a Boomer. Thanks to Ellie for giving a huge hand in this!

-Fixed missing face on death & reduced filesize a bit.

-Minor, non-noteworthy fix again.

-Minor cleaning of models, not worth an actual numerical update.