1) Fix not being able to show multiple dialogs at once in iOS
2) Fix cancelling the login dialog when XMPP auth is enabled without
   guest support

* fix: Fixes #10796 authentication in conference.

* fixup!

* fixup2!

Co-authored-by: Saúl Ibarra Corretgé <saghul@jitsi.org>

* fix(authentication) login dialog now closes when connection is established

* fix(authentication) fixed shibboleth auth

* fix(authentication) renamed authenticateExternal func to authenticate and updated its logic

* fix(authentication)removed logindialog.js and created actions.any

* fix(authentication) removed focus from externalauthwindow

* fix(authentication) removed private sign from some actions and added openLoginDialog to actions.any

* fix(authentication) exported all from actions.any

* fix(authentication) reverted change regarding externalAuth

* fix(authentication) fixed indentation

Up until now we relied on implicit loading of middlewares and reducers, through
having imports in each feature's index.js.

This leads to many complex import cycles which result in (sometimes) hard to fix
bugs in addition to (often) breaking mobile because a web-only feature gets
imported on mobile too, thanks to the implicit loading.

This PR changes that to make the process explicit. Both middlewares and reducers
are imported in a single place, the app entrypoint. They have been divided into
3 categories: any, web and native, which represent each of the platforms
  respectively.

Ideally no feature should have an index.js exporting actions, action types and
components, but that's a larger ordeal, so this is just the first step in
getting there. In order to both set example and avoid large cycles the app
feature has been refactored to not have an idex.js itself.

🔥🔥🔥

Delay the CONFERENCE_FAILED event until the user cancels the login
dialog using the 'recoverable' event flag.

The feature authentication affords recovery from CONFERENCE_FAILED
caused by AUTHENTICATION_REQUIRED. (Like the feature room-lock afforded
recovery from CONFERENCE_FAILED caused by PASSWORD_REQUIRED.)

Gradually, we exploded the error of CONNECTION_FAILED in multiple
redux state properties. The explosion makes maintenance harder because
the properties have to be updated in sync. Collect them in an object
resembling an Error instance.