Add callback for currency handling

Hello developers, I noticed that the documentation only mentions Player.SetMoney and Player.SetRuud.

I would like to request the inclusion of the same functionality for CashShop coins, so we don't need to work with caching or queries using onDS... Something like:

• GetWcoins(oPlayer, oValue)
• GetGoblinPoints(oPlayer, oValue)

Customizations that will have payment fees, such as new commands.

I used the onDS dataserver callback... But that wouldn't be the best practice.