Add "per skin" packing

[misaki-eymard]

If there are images that you want to include in all skins (e.g. face, hands), repacking at runtime can be costly in terms of repacking processing, and you may want to pre-pack all the images needed for a skin into a single page when you export the skeleton from Spine.
Currently, it is possible by organizing the folder structure, but it would be more useful to add a setting that would allow you to pack images based on which skin they are in.

Related post:
http://esotericsoftware.com/forum/Mesh-Bug-and-Feature-Requests-18312

[FabianoIlCapo]

+1 from me!

[misaki-eymard]

+1 https://esotericsoftware.com/forum/d/24977-is-it-possible-to-export-character-with-separate-atlas-for-each-skin

[SimonMino]

+1 from me!!