Fix tab entries dirty set leaking views, players & worlds #1384
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Tab entries have a dirtyset/cleanset that holds all views that need/don't need updating. Tab views get dynamically added/removed to those sets when the entry starts/stops being used, but on cleanup when a player leaves, the entries aren't removed.
That causes the following chain to stay in memory:
TabEntry.dirtySet -> TabView.viewer -> bukkit Player -> nms player -> nms world -> chunks etc