RFE for extensions «media-preview» — Lets add (optional) support for autoplaying video and video looping.

It's really needed for fast preview of lots of small files (video assets, visualizations, … for me — I need this for algorithm visualization, lots of small video files, constantly refreshing…)

Looks that it can be done by adding «loop video» and «autoplay video» options and changing several lines in extensions/media-preview/media/videoPreview.js like this:

	video.playsInline = true;
	video.autoplay = setting.video_autoplay;
	video.loop = setting.videoloop;

The (unfortunately abandoned) extension «Preview MP4» has these options, but will be much better to get it out of the box.