Link all submodules

All validation buttons should validate and send data to appropriate locations then take user to appropriate view.

• MainWindowController should encapsulate AuthentificationController and SidebarController.
• SidebarController should enable the user to open the channel creation Popup.
• AuthentificationController should take the user from :
  • Connection to Server Choice to Main Window
  • Connection to Registration to Detailed Registration to Server Choice to Main Window