NEW - QueryQuestsCompleted() requests that the server send the client a list of completed quest ids. Once the list is received the QUEST_QUERY_COMPLETE event is fired. (There is a limit on how frequently this can be called)
NEW - tbl = GetQuestsCompleted([tbl]) populates a table (creating one if necessary) with the ids of completed quests as keys with true values.
NEW - width = Texture:GetFileWidth() --Gets the width/height of the actual file in use by the texture. (0 if we can't access the texture for some reason) (Note: These currently aren't returning the right values for some Blizzard UI images)