Preference to automatically "Shield" (fake user) each type of data block.

On some projects using many linked mesh data blocks I'd want to enable auto-shield on mesh data blocks.

On some projects with many materials I'd want all materials to be auto-shielded.

I think most people most of the time would want all materials to be auto-shielded and some people might desire other data blocks to be auto-shielded so we should just make auto-shielding a thing and configurable per data block type.

If they're never going to get rid of the fake user system this would be a hopefully easy way to polish it and make it user friendly.

I'm just a hobby user so I wouldn't be surprised if there's actually very important uses for the fake user system but it seriously needs polish to make it more understandable for new users and configurable to not be annoying/destructive/work-day-ruining by default.