popup improvements and video events support

• UI fixes (device configuration, broadcast url update, internationalisation)
• Improvement of video player events (even with DASH video player)

UI improvements and video support

• UI fixes (dark theme, overscan, new resolutions, Android nav keys, ...)
• Adding support of DASH (tested under MIT-Xperts test suite i.e. default page)

Tagged for Firefox and Opera releases

• Firefox Quantum has bring the support of Web Extensions so this extension is now handling it
• Firefox extension is also usable under Android devices if you have previously installed Firefox
  (I have only tested it on Nvidia Shield in landscape mode and not in portrait)
• Opera is now Chromium based and also compliant with Web Extensions API