Rebalancing of cost/attack power of protolathe-printed bullet-firing guns.

Created by: icantthinkofanameritenow

To address the ubiquity of the AR to the point of it being spammed, it now spawns in the lockbox with no ammo and has half its current stun time; the ammo itself is a bit more expensive as well, though not to the point it will be prohibitive unless you have a ton of trouble finding silver. To compensate, it deals slightly more damage.

Specifically: -AR bullets deal 25 damage each, but no stun or weaken effect. -AR price is now 12500 metal and 12500 glass. -12mm rounds cost 4250 metal and 250 silver per box.

SMG is also tweaked a little, and now only costs iron and glass to build. Ammo still needs silver however, and it too begins with an empty magazine.

Specifically: -SMG now costs 10000 metal and 10000 glass.

Fixes #8628. Depending on what people want, I may end up increasing the size of the AR to bulky as part of potential changes proposed in #11487 (closed)