PlaybackSpeedView: Properly notify and update values changes
This merge request brings a fix to:
- The playback speed view that is now properly updated when the playback speed is changed outside the view.
- A notification is also sent when the reset actions are performed.
Fixes regarding the playback speed shortcut of the audio player have also been made, including:
- A notification that is now sent when the playback speed is changed via the shortcut in order to properly update the views concerned by this.
- The options navigation bar that is also properly updated, following the behavior of the playback speed view.
Closes #1754 (closed)
Edited by Diogo Simao Marques