Add the ability to overwrite sprite assets in the Sprite Editor while keeping references (multipack)

I would like to be able to update sprites in my Playcanvas project using Texture packer with "Multipack" turned on. (to export a series of atlases rather than one)
And for Playcanvas to replace the sprites currently named the same, that are already in the project. (Specifically for UI work)

Currently, all of the sprites get jumbled up if Texture packer reshuffles the items across the atlases.
Even being able to replace sprites in a folder with new ones of the same name (and they will in turn update in the scenes) would help.

As a dev, I don't want to re-update all of the sprites manually when I am sent new assets from the designers.
It's very common for all assets to be split over a fair few atlases.

Start by reproducing a Texture Packer import with Multipack enabled in the Sprite Editor and inspect how sprites are assigned across atlases. Trace how same-named sprites are replaced and how scene references are maintained; done means reshuffled multipack assets update existing sprites without manual scene re-linking.