Adds 2 attachments, one for CAR-4/AMCAR and the second one for all weapons that can use CAR stocks.

• Vintage Foregrip - +1 concealment
• Vintage Stock - -4 stability, +3 concealment (copies CAR-4 Folded Stock stats)

I didn't port sound moderator because it is already available in AMCAR Various Attachment pack by Alcat

Requires BeardLib