More currency support

[Dominik]

Is your feature request related to a problem? Please describe.
Yes. Only Essentials + XP support is few for this plugin.. :)

Describe the solution you'd like
I think we need more currency support for this plugin :) Maybe currency list. Because we have MobCoins, SoulPoints etc. and we need safe trading experience. :)

config:

- crystal
  - give_command: "crystal give {player} {amount}"
  - take_command: "crystal give {player} {amount}"
  - placeholder: "%placeholderapi_placeholder%"

Than the plugin use this placeholder to check "cost" in GUI, than 2 commands.. :D

Describe alternatives you've considered
X

Additional context
Thanks :)

Discord contact: krumpli_