Add Economy Support

[DNAmaster10]

Economy support is an essential feature which must be implemented before a full release. Some initial ideas:

Server owners should be able to customise the "type" of economy. Some initial "type" ideas include:

• default: Money is removed from player's account into thin air.
• guiOwners: Money is transferred from the player's account into the Gui Owner's account.
• beneficiaries: A tentative idea at best where gui owners can set multiple 'beneficiaries', and money will be split equally between them.

Server owners could also decide how ticket pricing works.

• Owners can decide whether the prices of individual tickets can be changed by the Gui Owners.
• If they allow Gui Owners to change ticket prices, a default value could be used, as well as a min and max value. This would need to be stored per-ticket in the database.
• If they don't allow this, the default value can be used alone.

Server owners should also be able to completely disable any economy integration. Some additional things to consider:

• Any money-related commands mustn't appear in tab completions if it is disabled.
• When commands are run, they should display an error message asking that economy support is enabled to use the command.
• Additional permissions must be configured, such as "ticket.changeprice", etc.