GRN2-180: First stages of refactoring code for v2.4 (#748)

* Email rescues and authenticator concern

* Application controller and helper clean up

* Moved controller code out of helpers

* More helper and email clean up

* Cleaned up remaining helpers and create omniauth_options

* Controller code clean up

* restructured views structure

* Restructured role code

* Restructured profile and code clean up

* Master merge

* Added bbb server concern to deal with bbb calls

* Bug fixes and changes after changes

* rspec

* More rubocop fixes

app/mailers/application_mailer.rb

@@ -17,7 +17,6 @@
 # with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
 
 class ApplicationMailer < ActionMailer::Base
-  add_template_helper(ThemingHelper)
   default from: 'from@example.com'
   layout 'mailer'
 end