Prevent screen locking on timeout when web pages are open about leobot HOT 7 OPEN

Currently the main page uses <iframe> to display the video stream. @YarynaD, is it OK to update this tag to <video>?

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@MaxZhaloba there's not much I know about video streaming. So, please correct me if I'm wrong. From documentation
http://wiki.ros.org/roslibjs/Tutorials/Publishing%20video%20and%20IMU%20data%20with%20roslibjs#CA-3fc6413f79f1645f69db70dc902a3a12ecc54f7c_155
it seems to me that video is streamed via "jpeg" files. In this case, <img> tag should be suitable.

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Just to mention, the imge from virtual camera is transferred in MJPEG format. More info on this method.

I've tried to render it using the <img> tag and it works, but no luck with <video> so far.

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I've found out that browser always treats the MJPEG stream as image. So we cannot render it as video in playing state. At the very most I was able to specify the MJPEG URL in placeholder attribute of <video> but in this case the screen was still locked in iOS Chrome.

@SystemDiagnosticss, I'm passing this task over to you. Feel free to proceed with the approach that uses a plugin for this purpose.

P.S. The method suggested in task #85 is another option to render an MJPEG stream.

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@MaxZhaloba thanks. I tested NoSleepjs lib in my lockal branch. Its work fine. But now I add its directly in js folder without cmake. This lib need webpack build.

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@SystemDiagnosticss, which branch could I use to configure the automatic assembly of NoSleepJS?

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@SystemDiagnosticss, I'm thinking that most likely we won't need the NoSleep JS in next release since we'll probably be rendering a real video stream using <video> tag and VR API (task #104).

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