Synced lyrics

This update adds lyrics fetching and display. Synced karaoke-esqe lyrics will be fetched if possible.

Lyrics are currently shown in the player pane. Our current source of lyrics is LRCLIB.

I'll probably add custom lyrics support (via copypasting or .lrc files) in a later PR.

Others

• Fix: sidebar not switching to Queue button when queue view is reached via the "jump to pane" button in mini-bar.

IMPORTANT: This update fixes the last remnants of the old app ID (not Flathub compliant) in the settings schema. Due to this, if you are updating from an older version you might run into crashes related to GSettings schemas not being available.

To fix this you will need to reset your settings. This is unfortunate but such is alpha software :(

# Both user and system
dconf reset -f /org/euphonica/Euphonica
sudo dconf reset -f /org/euphonica/Euphonica

You might also need to remove Euphonica-related files in ~/.local/share/glib-2.0/schemas/ and /usr/share/glib-2.0/schemas, then restart your system.