[WIP] Index navigation improvements - EP04

Once again, opening this to contain any discussion/feedback.

This is in LATEST builds.
https://github.com/MayhemYDG/4chan-x/wiki/4chan-X-LATEST

The goal is to replace the official catalog.
In a **future** 4chan X version, support for the official catalog will be completely removed, saving a good amount of useless code.

TODO:
- [ ] Show lock/sticky status
- [ ] Update thread stats on refresh
- [ ] Update lock/sticky status on refresh
- [ ] Show filter highlight
- [ ] Make sure index events callbacks operate properly when in catalog modo
- [ ] #836
- [ ] #1256
- [ ] #1037
- [ ] #1327