video player : fix brightness and volume gestures
This MR fix brightness and volume's gesture based controls in video player
What changed :
- Fix the brightness/volume change with motion based on gestures velocity
- Improve gesture activation delay by removing unneeded constraints to some other swipe gestures
- Add the ability to use/test those gesture on simulator where device APIs related to audio output volume and screen brightness can't be used
- Remove unused gesture handlers
- Set shared AVAudioSession instance as the active one
Closes #712 (closed), #988 (closed) and #1226 (closed)