Gamepad controller support for VideoPlayer

Here is the mapping

A : play/pause
B : Audio Track
X : toggle mute
Y : Select subtitle
R1 : seek forward
L1 : seek backward

Left stick:
Horizontal axis: seek
Vertical axis : brightness

Right stick:
Vertical axis: volume

Please tell me if you have a better idea of configuration
video_grid: prevent focus loss
sidelist: prevent focus loss
deterministic focus change following closeDrawer with forgotten import
focus initialization