Support multiple currencies

[CrazyPyroEagle]

Although not all economy services have multiple currencies, it'd be best to support them anyway.
I'd suggest a way of using a currency's symbol on the price line of the sign to define which currency is used.

For example: "$100" on the third line of a sign

If no currency is specified, AdminShop uses the default.

[hsyyid]

What if two currencies use the same symbol..?

[CrazyPyroEagle]

In that case, you could instead require it to use the currency's display name and then automatically replace that with the symbol.

[hsyyid]

What if the display name was too long???

[CrazyPyroEagle]

That's when you use a /setcurrency command (or something similar), just like /setitem.

[hsyyid]

@CrazyPyroEagle I'll work on it - I'll have it so symbols are default, but if multiple currencies come up you'll have to use /setcurrency