Fix ironsight smoothing, optimize, optic tweaks

Updated PBR textures, gun will be ... welll ... metal, but i promise it will look waaaaaaaay better than before

Added exponent map, better shader so rymd can stop yadahyadah around my ears

Fix bipod animations

Revert using Vanilla bipod, MrB's causing issue with my Barrett M107 bipod on Sernix server

Better shaders
New mount position for realistic view
/o/