Enable stepless adjustment of the volume control slider
Previously, the volume would be adjusted in 2% steps, which is needlessly imprecise and also makes for poor UX. This change makes the volume slider smoothly adjustable.
CC @phw : Are there any hidden gotchas with stepless adjustment with regards to logarithmic volume scaling?
TODOs:
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Rescale volume slider to 0..100 to keep keyboard input functional
This Merge Request includes:
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Tests -
A changelog fragment (cf https://docs.funkwhale.audio/contributing.html#changelog-management)