qml/PlaybackSpeed: Revamp implementation
This MR revamps the PlaybackSpeed implementation as seen in the Tracks panel and the ButtonPlaybackSpeed Popup.
It features the following:
- A list of presets
- A 1.00x reset button and min / max labels
Decrease / increase speed buttons- Clamping on the 0.96 and 1.04 "video enthuisasts values" (tm)
- Functional keyboard navigation
Edited by Benjamin Arnaud