True if the specified addon is loaded.
loaded, finished = IsAddOnLoaded(index or name)
- index - The index from 1 to GetNumAddOns(). Note that you cannot query Blizzard addons by index.
- string - The name of the addon (as in toc/folder filename), case insensitive.
- boolean - True if the addon has been, or is being loaded.
- boolean - True if the addon has finished loading and ADDON_LOADED has been fired for this addon.