API SetCurrencyUnused

Marks/unmarks a currency as unused.
 SetCurrencyUnused(id, unused)
== Arguments ==
; id : Number - Index of the currency in the currency list to alter unused status of.
; unused : Number - 1 to mark the currency as unused; 0 to mark the currency as used.
== Notes ==
* When a currency is marked as unused, it is is placed under the "Unused" header in the currency list; this is always the last header in the list. This alters the currency's index in the currency list.
* The isUnused return value of can be used to get the current state.