Fixes https://invent.kde.org/plasma/plasma-mobile/-/issues/422
This commit simplifies the AudioInfo data provider to fetch the volume
directly, rather than relying on a series of complicated connections. It
also does some cleanup of AudioInfo, removing unused functions.
Personnaly, I don't like much those static icons which doesn't care about the situation in the quicksettings. This MR intends to use when possible and coherent what I call (not native English-speaking I recall) « adaptive » icon.
List of modified quicksettings :
- Wireless
- Bluetooth
- Flashlight
- Audio
- Airplane mode
~~Draft right now because I'm doing it quicksetting-by-quicksetting.~~
EDIT: Feel free to cherry-pick if you don't agree with all icons.
The eventual goal is to have as few singletons with state as possible in the mobileshell component when it is imported into components such as the lockscreen.
This doesn't fully accomplish it, but moves the audio provider singleton to MobileShellState, which will eventually need to be prevented from importing into non plasmashell processes.
This also disables the sound feedback when changing volume, since it can be a source of lag when showing the applet.
