- Cleaner design for the backend user_files classes and simplified
interaction with QML
- Config and theme files will now automatically reload when changed on
disk
- Removed manual reload keybind and button
Use native ListModel which require a lot of changes, but should be
much faster than the old way which exponentially slowed down to a crawl.
Also fix some popup bugs (leave/forget).
Not working yet: side pane keyboard controls, proper highlight,
room & member filtering, local echo replacement
