Renames 'videoConnectionMessage' to 'localConnectionMessage', because
it is displayed when we're having problems with our local connection
and a different one will be shown for the remote connectivity issues.

Grey filter will be applied to the remote video/avatar displayed on
"large" and a message indicating remote connectivity issues will be
shown on top of that.

The problem is when not using / before virtual files and having a base for the page nginx can search for the file in wrong location.

Moves favicon into the title html with all metadata for easy overriding. Moves the title html inclusion after all the connection optimisations to avoid downloading the icon to interfere those optimisations.

update whitespace in toolbar buttons array to allow value to be more easily overridden

Make FF stop complaining about the character encoding of the HTML document
not being declared.

left blank in default meet installations, to be overridden by adding <base href="CDN_URL"> to /base.html