* Removes unused config logic.

* Whitelists config options that can be overridden using the URL.

* Recorder login with credentials, not supported by externalconnect.

Jibri uses xmpp credentials to login, which is not supported by externalconnect, so we want to skip it till that is supported.

* Whitelist only config.js

* Extracts whitelisting in separate function.

We just call the parent class' method, so just get rid of it.

In aa93a783, remote videos not scrolling on Firefox, IE, and
Edge was worked around using CSS. The CSS selector is too vague
and also catches horizontal filmstrip. The selector should
apply to vertical filmstrip only.

* ref(analytics): centralize all event names

* squash: fix typo and alpha ordering

* squash: rename file to AnalyticsEvents to parallel lib-jitsi-meet

 fix(welcome-page): fix alignment issues

Currently all.css is loaded after app.js. This means there may
not be a guarantee that the css is loaded before the js, which
is bad because the js does dom querying for sizes on elements,
but some element sizes will be affected by js. So instead load
css upfront and let the browser block as needed or at least
give the css a head start in racing javascript to load.

- Modify Etherpad and SharedVideo so their resizing takes into account
  the width of the filmstrip in vertical filmstrip mode.
- Modify Filmstrip's getFilmstripWidth to account for when the filmstrip
  is hidden.
- modify VideoContainer so in vertical filmstrip mode it centers the
  shared desktop stream in the middle of the available space not taken
  by filmstrip.
- Also allow clickthrough on the secondary toolbar itself while still
  allowing clicks on the toolbar's buttons. This allows clicks on
  shared videos to go through.

Rounded corners on the first and last buttons. Size of the hangup button
on hover.

Something is causing firefox to show scrollbars on the remote videos
container even though there is plenty of room. I lost this battle
and just made the container taller...

Using column-reverse prevents proper scrolling on browsers other than Safari
and Chrome. Additionally, Firefox has an issue where flex containers have
dimensions set to auto, preventing resize. So, add hacks to maintain Chrome
and Safari's behavior while allowing for some kind of scrolling on other
browsers.

The goal is to reduce usage on atlassian/aui. New components
have been created to display the settings panel. Language
selection will reach into i18n for state whereas moderator
options will keep state in redux.

Properly handle errors while connecting or joining a conference. Prior to this
patch, only errors on established conferences / connections were saved to the
redux store.

Don't wait for the connection to be made, since in some cases, when auth is
rquired, for instance, that won't happen until the user inputs their
credentials, but the dialog would be overshadowed by the overlay.

75bf7638b3 introduced this regression, state must
be assigned as an object, even though one would think it's automagically
initialized to an object. Oh well!

feat: add more accessibility labels