Inspired by the document at jitsi/jitsi.

Fix incorrect password dialog message when using authentication.

This is to help understanding how things are wired.

Firefox (at least) renders it verbatim.

Updates transport type to show multiple values as we do for addresses and ports.

Post load error handler

Adds a placeholder which allows to write a plugin for executing some
code after the "load error handler" is triggered. A function named
"postLoadErrorHandler" should be defined in one of
the "#include virtual" files.

ref(avatar): Move Avatar and ParticipantView to base/participants

Split language detectors to be web/native dependent. Take care of strings that contain html.

Adds translate function with default namespaces and options.

config: switch default disableRtx to false

The error raised by JitsiMeetJS.init() is already in the state of
features/base/lib-jitsi-meet so it's not a good design to store the same
error in the state of features/unsupported-browser.