Fixed hands disappearing when aiming. Replaced with a simulated hand model of the equipped gun, but note that it won't match the gun's custom skins.
Fix Custom_Model_Data number for merge resourcepack between to "Assaulth_Rifle_Vol.1" and "Sniper_Rifle_Vol.1" to prevent them from having overlapping Custom_Model_Data numbers.
- Supports version 1.21.11 or later, and 1.21.4 and above.
- Fix WM to support the WM configuration under the projectile category.
