Weapon skins addition for xmelee

<h2>Dependencies: <a href="https://mods.vintagestory.at/xmelee">xmelee mod</a></h2> <p>More info on wiki <a href="https://github.com/kenigvovan/xmeleecan/wiki">page</a>.</p> <p>If anybody interested in creating new models/textures for weapons, I would use some help=)</p>