Add filter in blacklist editor

[stypb]

Is your feature request related to a problem? Please describe.

Finding the blacklist entry that I'm looking for can be an exercise in scrolling.

Describe the solution you'd like

It would be great to have a filter search bar thing.

Describe alternatives you've considered

Currently I use the browser and ctrl+f if I get particularly frustrated, but that sucks.

Additional context

[hunting4code]

I'm going to clean up the UI a little (the search bar is a little ugly right now) and then I'll submit a pull request