We now show jitter, lost packets and turn server informations

When audio is inactive, the browser shows an error related
to this undefined reference.

We also adds this information when copying data to clipboard

We now retrieve update information about active video peers, and calculates
download and upload rates. These rates are the sum of data transfered in
all video peers.
Screenshare stats is not being added to the sum, yet.

Using getStats api and peer information to retrieve upload/download rates
and transport information

Adds a label in connection status modal,
where users will be able to copy information to
clipboard.

Replace previous icon with a flexible version to fit inside other
nodes (e.g: buttons).

 - Removed the connection-status history from the user list's gear
icon and now is opened by the connection-status button. Moderators will
render the same modal as before and viewers will only have access to their
own data.

 - Added data-savings shortcut at the connection-status modal.

 - Added websocket round-trip time.

Use the former Flash client avatarURL join param to replace the name
initials avatar from the user list, chat, waiting guests and connection
status list.

It is possible to define a defaultAvatarURL at bbb-web and enable/disable it