Export Per Object to Folders

When exporting from AmorPaint, it would be nice if there was an option to create a folder for each object instead of placing all the textures in one folder.

The issue names no files, tests, or entry points; begin by locating AmorPaint's export implementation and reviewing how object textures are currently written. Confirm the desired folder-per-object behavior and verify that exporting multiple objects places each object's textures in its own folder without breaking existing export behavior.

Written by the indexing model from the issue text.