- old toolbox actions
- chat command processor
- room subject handling

This PR takes The Bulldozer Approach (R): removes the old toolbox and lots of
associated code, though not all of it. Subsequent cleanups will follow.

After looking at the jquery-ui documentation, I believe it
is being used only in one place, when toggling the smiley
menu. That toggling has been quickly replaced with a normal
jquery call.

Note: @atlassian/aui also uses jquery-ui but killing that
off will be more difficult due to its CSS being used.

Will override email, display name and avatar URL with the values
provided in 'context.user' structure of the JWT token.

Settings will no longer be used to retrieve local display name,
email and avatar URL. Now those values will be obtained from
the /features/base/participants Redux state.

fix(jwt/middleware): use const for default name

fix: wrong default display name on web

ref(base/participants): remove getDisplayName functions

ref(jwt): do not accept unknown user fields

Fixes a TypeError: Cannot set property 'innerHTML' of undefined
                    at o (Chat.js:61)
                    at Object.updateChatConversation (Chat.js:271)
that is thrown when joining a conference with messages already set to the chat. The error used to remove a strophe handler and chat was not working at all for those seeing the error.

https://github.com/jitsi/jitsi-meet/pull/1397 (React Toolbar) is huge at
the time of this writing. In order to reduce it, I'm extracting changes
not directly related to React-ifying the Toolbar such as added jsdocs
and source code formatting.

The extension of the file modules/UI/side_pannels/chat/smileys.json
suggests that the format of the file is JSON. However, it contains
JavaScript RegExp instances which do not represent valid JSON. Such
discrepancies between file extension and format cause failures in
certain tools such as Webpack. Convert the file (both extension and
format) into a valid ES2015 module.

Receiving messages docks the toolbar to be able to see number of unread messages. We need to undock it when we read the messages. We skip undocking if we are not in video mode (on large), cause stuff like youtube video share is docking/undocking the toolbar.

This reverts commit 93648f361b.