Purchasing skills for ingame currency

[NeumimTo]

Feature which allows players to buy skill for ingame currency

• In the API create
  EconomyService#hasFunds(IActiveCharacter, BigInteger)
  EconomyService#widthDraw(IActiveCharacter, BigInteger)

• Implementation in the Sponge module - just a wrapper around sponge EconomyService, if theres no economy plugin installed just return false on hasFunds.

• Refactor skillnode configuration

  • SkillPurchaseCostProcessors: [{
    class: XXX
    ...
    }, {...} ]

Concept similar as class level curve definition.
Options:

• Purchase skill for skillpoint
• Purchase skill for ingame currency
• Purchase skill for Item
• Processor which allows script execution to run custom validations.

The config option shall be a list, so it will be possible to combine skillpoints and ingame currency etc.