Custom Gun Continued

• Remove several configurations
• Adjust default configuration values
• Add sync config hideEntityHitbox
• Fix render config GunLodRenderDistance issue

1.20.2+neoforge:

• Fix ammo stacking and projectile issues caused by Mixin configuration

1.21.1+:

• Fix gun model and gun projectile rendering offset when firing while aiming down sights

1.21.10+:

• Correct rendering position of guns on back