A renaming tool that automatically add custom prefix to custom classed assets, with undoable steps

Making a structure for auto-renaming, and adding some default value to the array.

For the autonaming part, use the structure to filter what's supposed to be renamed first

Use the functions for two kinds of buttons: 

Whenever adding the prefix, add this step to an undo structure array, including the assets chosen and their names

So that we can simply use a button to undo any changes made to the names!