API C LFGList.GetAvailableCategories

__NOTOC__
Returns a list of available LFG categories.
 categories = C_LFGList.GetAvailableCategories([filter])
==Arguments==
:;filter: - Bit mask to filter the results. If omitted the function returns all categories. See C_LFGList.GetActivityInfo for more information.
==Returns==
:;categories: - A table containing the requested categoryIDs (not in order).