Make the whole map history visible

It would be useful to make the whole map history visible and not have it limited to a single session. We know the whole map history is saved by Inkarnate but the site only shows changes made during the actual editing session.

Use cases :

• Revert to an older state before unwanted changes were saved.

• Avoid losing history in case of a crash.

• Avoid having the future auto-save save an experimenting state we'd like to go back upon.

• Reach an older variation of the map that was not saved as a clone to export it or slightly tweak it.