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Animation: Motion Paths Refresh All

Adds a button, Update All Paths, to the Motion Paths property tabs and
will always show. The operator goes through all visible objects and
updates their motion paths.

The current implementation has a subtle functional change. Calculating
or updating motion paths for armature objects (through the Object tab,
not Armature tab) now also updates the paths for its bones. We could
preserve the old behavior but it doesn't seem necessary. It seems more
likely that the animator wants to update both anyways.

Reviewed by: sybren

Maniphest Tasks: T83068

Differential Revision: https://developer.blender.org/D11667