Refcator and add key records, attachment records

enzevalos_iphone.xcodeproj/project.pbxproj

enzevalos_iphone/Autocrypt.swift

enzevalos_iphone/CNMailAddressesExtension.swift

enzevalos_iphone/MailAddress.swift

enzevalos_iphone/PersistentKey+CoreDataProperties.swift

enzevalos_iphone/UserData.swift

enzevalos_iphone/mail/IncomingMail.swift

enzevalos_iphone/persistentData/AttachmentRecord.swift

...ata/DataModel.xcdatamodeld/DataModel.xcdatamodel/contents

enzevalos_iphone/persistentData/PersistentDataProvider.swift

enzevalos_iphone/persistentData/Properties.swift

enzevalos_iphone/persistentData/PublicKeyRecord.swift

enzevalos_iphone/persistentData/SecretKeyRecord.swift

enzevalos_iphoneTests/AutocryptTest.swift

enzevalos_iphoneTests/CoreMailTest.swift

enzevalos_iphoneTests/GeneratedMocks.swift