Add the ability to specify layers for the image and layers for the normal map

[nklbdev]

[baudren]

Hello! Thanks a lot for your plugin, very useful already.

In my workflow, I edit a large scene but I need to load each layer in their own files. I used to run a script to run this export, but when finding out about this tool, it felt that this could do it. As far as I could find, not yet, but maybe this open issue concerns this point?

To be extra clear, I have one aseprite file with several layers. In my scene, I would like to use this aseprite resource, with an index, or a layer name, so that only this layer appears.

Thank you in advance for your help!

Cheers