Signet Ring Quest Reward Overhaul

This change is an overhaul of the Signet Ring Quest Reward table:

When you return a signet ring your chances (of getting 1 of below) are:
40% = Money (20-40k)
15% = Invis Ring + Money (5-10k)
15% = (25 Purps, or 25 Ents) + Money (5-10k)
10% = Rose
10% = (25 Inkies, or 25 Mints) + Money (5-10k)
5% = Random Sided Prism
5% = Random Mask Gift