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This should fix all the issues with gizmos, plus improve the performance and prevent any performance drain on scenes that aren't using gizmos. I feel it also simplifies the logic in some places. Objects are now linked directly with gizmos for fast lookups and shouldn't become stale because the system is re-initialized on any change, this also means that there is no further use of a dedicated remove gizmo function, so it has been removed. Blender's msgbus system has been employed to trigger a refresh when a gizmo object is renamed (unfortunately bones seem to be too unstable to be subscribed to directly, so a refresh is triggered on any bone rename)
This PR fixes issues:
#83
#84
#85
#86
#87