Add a way to specify many skin names to export

[misaki-eymard]

Currently, you can export any combination of skins by choosing the skins in Spine and then do the export in the UI, but you can not choose multiple skins to export via script. This makes it very time consuming if you have a large number of skins combination patterns you want to export. To make this workflow more efficient, we should add a way to specify many skin names to export.

Related post: http://esotericsoftware.com/forum/Script-for-export-17429

[misaki-eymard]

There is an idea for Skin sets that save a configuration of pinned skins itself: #562

[nikes]

+1