Pyro Remake: Hotfix 1

Patch note:
- Fixed model and material paths. Now there is on "models/biedron/player/pyro/" path, instead of "models/player/pyro/". This could avoid issue with overlapping files with existing ones.
- Added bodygroups. Now you can disable head, grenades and backpack like in original model.
- Fixed materials. Now googles works properly as should work and on ubercharge effect are glowing.
- Changed mesh normals. Now backpack have additional sharp edges.