vidscotch di WKLaume

Allows for better control of video when mouse is over the video with arrow keys. Alt/Ctrl/Shift+L/R advances by 1/30, 1 and 20 secs respectively. Alt/Ctrl/Shift+U/D changes vol by 1%, 5% and 20%. All can be combined. Adds skip button. Also provides a menu to find all video elements on the page and lets your pause/unpause, mute/unmute, highlight the video and/or bring the video to the maximum foreground. Alt + j/l has been added to increase/decrease playback rate.