Added option to group only within libraries. #3
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I added an option to limit the grouping to items that belong to the same library. This can be configured in the settings and the default is still the old behaviour, so it shouldn't interfere. Switching between the two modes should work just fine with the changes being applied after manually running the grouping task.
I do not have any experience with emby plugins (or C#) and I couldn't find a way to access an item's library id from the item itself (item.getParent() returns the the parent directory instead of the library), so I went the extra step to change _itemsList to accept tuples that include the library id. There's probably a much better way to do this, but it works just fine.