For browsers that don't support headerBytesSent in RTCOutboundRtpStreamStats
neither headerBytesReceived in RTCInboundRtpStreamStats, we are now able
to calculate upload and download rates.
We are also able to get transportStats information for browsers that
don't support iceTransport attribute of RTCDtlsTransport.

Added support for getStats in screenshare's service. This works similar
to the getStats for video provider, and the information retrieved from
screenshare is added to the video information for cameras.

We also adds this information when copying data to clipboard

The specification has more details about each field returned in stats
dictionaries.

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

Simplify how connection status inteval is configured and make server
log the solo logging option.

Includes a log at Meteor's addConnectionStatus method to log danger,
critical and recoveries triggers on user's connection status change.

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

Push offline users to the bottom of the list.

 - 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