NCR money

Implemented NCR currencies:
 * NCR dollars, an overview of NCR currencies.
 * Money ($1 NCR), the primary currency of Fallout 2.
 * $5 NCR, the most common of three currencies used by the NCR in Fallout: New Vegas.
 * $20 NCR, second largest currency note used by the NCR in Fallout: New Vegas.
 * $100 NCR, the NCR's most valuable bill in Fallout: New Vegas.
 * NCR currencies are considered miscellaneous items in Fallout: New Vegas.