Add option "Auto Add Fake User" to user preferences

[LudvikKoutny]

I made a proposal for this quite a long ago:

Proposal: Explicit Management of Data Blocks and (possible) Deprecation of Fake User

This proposal is intended to provide a unified vision for multiple changes necessary for the introduction of explicit data management in Blender and eventual deprecation of the controversial Fake User workflow. The Fake User workflow has been a significant pain point for a large portion of the Blender community throughout the entire history of Blender’s existence. Despite this history being over a couple of decades-long, the Fake User workflow has failed to prove itself as a superior, or at lea…

I think this should be solved in more complex and forward-future looking manner than polluting user preferences.

Auto add fake user set of user preferences is unfortunately a sticks and stones solution. More of a tradeoff, since you won’t get your work nuked randomly, but there’s still no convenient place to search, manage and clean up datablock you no longer need, so clutter would start to pile up.