enhancement: Asset editor Models save button, refresh after save and backups

[ghramsey]

While you're going to be working on bug swatting and enhancements of the asset editor for models

I'll suggest three thing given my experience; An explicit option to save or some indicator to know it's saving.
Refresh after saving. The bug #198 would have been noticed sooner with a refresh following a save.
To date in order to refresh I load a different map and then back.

And some sort of sanity check option. Either a backup of the models before saving or a manual option to
save the models before saving. I've had to revert to vanilla game files at least 5x while messing with editing the models.
Granted some is due to the bug. But still seems like anything going wrong causes all sorts of problems.
I had a particularly nasty model issue where everything was a mess of models mashed together.
The game functioned with the alien(s) able to locate me just fine but I had complete visual chaos from an error in
either the models or something I failed to do in commands editor with linking the model to the 'tinybutton object
I've been working to reproduce in the hab_corporatpent map

Does the game cache any of the game files other than creating a save file? I have reverted and still have it "remember"
the changes even though I reverted to vanilla game files and used save files from May. Cloud saving is off so I have no idea why.

So for that reason some sort of ability to revert more easily seems prudent given how game-breaking any errors in the file can be introduced.