API IsUsableAction

Determine if an action can be used (you have sufficient mana, reagents and the action is not on cooldown).

isUsable, notEnoughMana = IsUsableAction(slot)

Arguments

 * slot : Number - Action slot to query

Returns

 * isUsable : Boolean - true if the action is currently usable (does not check cooldown or range), false otherwise.
 * notEnoughMana : Boolean - true if the action is unusable beacuse the player does not have enough mana, rage, etc.; false otherwise.