Add option to customize the naming of exported PNG/JPEG sequence images

[misaki-eymard]

Currently, when exporting an animation as a sequence of PNG or JPEG images, the default naming convention is <Animation Name>_0.png. No matter how short you try to make the name, it will always be _<Frame Number>.png, and you cannot remove the underscore or replace it with another symbol. It is also not possible to specify the digits of the frame number. Adding some naming options to export sequence images with customized naming such as 000.png,<Animation Name>000.png would be useful for use the exported images in other software.

Related post: https://ja.esotericsoftware.com/forum/d/24908-custom-export-for-png/

[deemonrider]

This would be a great addition! In my case having the exported PNGs named like they are named in spine would be such a huge improvement.

So when I have a skin called hair1 that the output file also includes hair1. Otherwise I need to rename dozens of files and the atlas file content everytime I want to export as I have a postprocessing script for the hairs of my characters and it can't find the correct file if they all have the same name :(