GP 37 addon fix + non degradable (1.0)

This mod fixes the GP 37 to allow the M203 Grenade Launcher and silencer to be attached. It also makes the gun non degradable.
GP 37 Addon fix and Non Degradeable by crucible Description: This mod simply fixes the problem with the Gp 37 not being able to have the M203 Grenade Launcher and silencer attached to it. It also makes the weapon non degradeable so you won&a