Russian Gas Mask

I imported the Russian GP-5 Gas Mask model from Sketchfab.

Model: https://skfb.ly/6QSYs

#1.0.1 Changelog
- Fixed arsenal bug. Masks now can be equipped from all arsenals.
- Added two color variants: Black and White.
- Added item descriptions.
- Changed weight to 1.09 kg which is the real weight.
- Changed inventory previews.

#1.0.2
- Changed thumbnail.