GRN2-176: Create a role editor that allows admins to specify what permissions each role has (#709)

* Add roles editor

* Add colour selection ability to roles

* Add ability to assign roles to users in the UI

* Remove rolify and replace it with our own custom roles implemenation

* - Fix all existing roles functionality
- Fix super admins

* Fix bugs with new customers not have default roles

* Add can't create room setting

* Code improvements

* Fix migration

* Add tests for new methods

* Translate reserved role names

* Pull roles from saml/ldap

* Fix rspec

* Fix scrutinizer issues

* Fix email promoted/demoted tests

* Apply comments

* Redirect directly to the main room

* Add comments

app/helpers/admins_helper.rb

@@ -78,4 +78,8 @@ module AdminsHelper
   def room_limit_number
     Setting.find_or_create_by!(provider: user_settings_provider).get_value("Room Limit").to_i
   end
+
+  def edit_disabled
+    @edit_disabled ||= @selected_role.priority <= current_user.highest_priority_role.priority
+  end
 end