Render them together with bottom sheets in a FullWindowOverlay.

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

Don't print the room name, which could be long and nondescriptive.

* 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

🔥🔥🔥

This reverts commit 7e831117b6.

* Javadoc introduced @code as a replacement of <code> and <tt> which is
  better aligned with other javadoc tags such as @link. Use it in the
  Java source code. If we switch to Kotlin, then we'll definitely use
  Markdown.

* There are more uses of @code in the JavaScript source code than <tt>
  so use @code for the sake of consistency. Eventually, I'd rather we
  switch to Markdown because it's easier on my eyes.

* Xcode is plain confused by @code and @link. The Internet says that
  Xcode supports the backquote character to denote the beginning and end
  of a string of characters which should be formatted for display as
  code but it doesn't work for me. <tt> is not rendered at all. So use
  the backquote which is rendered itself. Hopefully, if we switch to
  Markdown, then it'll be common between JavaScript and Objective-C
  source code.