Weapons parts and more ways to repair them

[MrTrololo]

Weapons (especially guns) contains certain amount of parts,so we might to find them in various places and assemble weapons with them (for example:firing pins,springs,stocks,receivers,magazines,barrels,bolts,etc.for guns)(handles,axe blades,hammerheads,etc for melee weapons) we would also repair at least guns with replacing degraded parts with new ones,knowledge to assemble guns might be also required(police officers,veterans and hunters would start with that knowledge)