Update ViewBox

Update ViewBox Media Browser LITE. The provenance of the previous version was unclear. This is a proper inclusion of the LITE version is can be used freely.

Also, it is enhanced to recognize more link types (for example youtu.be) and to avoid interfering with the stylesheet.
Merge branch 'update_viewbox'

Conflicts:
	forum/skins/default/media/style/viewbox.css
	forum/skins/default/templates/question.html