Removes micro mechs

[MisterGrimm]

• Removes micro mechs, and all code, equipment, and icons related to them. Frees up alot of bloat in mech fab, and prevents people from accidentally using micro mech weapons.
• Saves the micro mech shotgun, fixes it so it works like a shotgun, and adds a new shell type for it.
• Said saved mech shotgun is now called the Liandri G-13 "Boomstick", comes with a integrated ammo lathe for four different kinds of ammo. Ammo types are buckshot, beanbag, slug, and dragonsbreath.