F1 TV Playback Controls eftir Outlandnish

Adds the following YouTube style playback controls:

[space]: pause / play the video
m: mute / unmute the video
[up arrow] / [down arrow]: increment / decrement the volume by 5%
[left arrow] / [right arrow]: backward / forward by 5 seconds
j / l: backward / forward by 10 seconds
f: fullscreen
[1]...[9]: skip to 10%...90% of the video
[home]: seek to the start of video
[end]: seek to the end of the video
[s]: sync videos from multiple tabs

FAQ / Troubleshooting
The playback controls aren't responding
Refresh the page and it should start working again.