Merge branch '263-restructure-authentication-2' into 'dev'

enzevalos_iphone.xcodeproj/project.pbxproj

enzevalos_iphone/AppDelegate.swift

enzevalos_iphone/AuthenticationModel.swift

enzevalos_iphone/AuthenticationScreen.swift

enzevalos_iphone/AuthenticationViewModel.swift

enzevalos_iphone/MailAccount.swift

enzevalos_iphone/MailServerConnectionError.swift

enzevalos_iphone/MailSession.swift

enzevalos_iphone/de.lproj/Localizable.strings

enzevalos_iphone/en.lproj/Localizable.strings