✨ Search entire EPUB text and vertical scroll reader

[aaronleopold]

Resolves #269
Resolves #276

PR adds two new features, and fixes a few bugs introduced from the hide libraries feature:

• You can now search the entire content of an ebook with the built-in reader
• I added a new vertical scroll reader
  • The library I chose, while it was easily the least headache of some of the other virtualization options I have tried, doesn't support horizontal lists yet. I'll try to see what effort adding that would be. You can see the context here: Feature request: horizontal list petyosi/react-virtuoso#62
• Hot fixed restriction filters swallowing relational filters, which in plainer words resulted in the wrong items being shown in the wrong libraries when adding filters on a relation from the client to the server

I have to add a basic toolbar to the vertical reader, and I'd like to try and clean up the fix to be a bit more efficient in terms of the resulting query, but this is mostly good to go