Jonas Jenwald 7f53fb82a5 Remove the OverlayManager.unregister method since it's completely unused
This method was added only for consistency with the `register`-method, however it's never actually been used. To avoid including dead code in the builds, let's just remove the `unregister`-method for now.

*Please note:* If this method ever becomes useful, it'll be trivial to revert this commit.
2023-06-21 13:13:53 +02:00
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