[ADD] Visibility smart filter

[vaexe-eve]

Description

This change adds a new filter. Happy to rename the filter if you think naming it SharingFilter or something would be more descriptive. SharedFilter just seemed like a weird name.

I've not done much work on auth plugins, so if there's any problems please let me know and I'll fix them up.

Fixes #96

Type of Change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have checked my code and corrected any misspellings

[ppfeufer]

Hey there, thanks for taking a crack at this.
However, some remarks:

• VisibilityFilter might not be the best name. SharedCharacterFilter or something along those lines might be better. Basically, a name that reflects what this filter does.
• Reverse logic, as the only setting in the model, is not really intuitive. Like, what logic are we reversing here? A simple dropdown selection, like "Has characters shared with recruiters: Yes/No", would be better and make the reverse logic checkbox obsolete.
• Please run pre-commit before committing …

[vaexe-eve]

Ah sorry, I missed that part of the docs (pre-commit). I'll sort all of that out. 👍

[ppfeufer]

Any updates on this?