Multimedia: Converted the youtube player to the HTML5 version
Merge pull request #4071 from LaurentGoderre/multimedia-youtube

Multimedia: Converted the youtube player to the HTML5 version
Details: fix open/close on devices with touch events

The `touchstart` event also causes a `click` event on touch
devices, which resulted in a double invoke of the open/close action.

Removing the `touchstart` and `vclick` events allows the `click`
event to work as expected.
gh-pages