Clean tool: remove unused physics/collision cages

[mokujinh]

Thank you for the fix of the redundant data for hairs using the clean up tool. I was wondering if there's also a way to include the auto deletion of the physics cages (in case they are assigned for outfits or hairs in the UI). As they remain in the UI even if the object they were active for were deleted. This is not really necessary as just deleting them manually would suffice, but deleting them manually also leaves an error for the missing cages in the UI that could confuse casual users, the fix is going to configuration mode and manually delete the cages from the UI too but most users don't seem to use the configuration mode, so I thought that even if the cages are not deleted by the clean up tool, they can at least be removed from the UI physics menu if the outfit/hair mesh they are linked with are deleted?

[Mustard2]

You are absolutely right, I forgot to do this! And I guess to some extent, the same problem happens also for armature layers. I'll fix this :)