Swift migration

[SystemKeeper]

Just an overview of our ObjC files by size:

✗ find . -name "*.m" -print0 | xargs -0 stat -f "%z bytes %N" | sort -n -r
182917 bytes ./NCAPIController.m
108396 bytes ./RoomInfoTableViewController.m
98196 bytes ./CallViewController.m
77855 bytes ./RoomsTableViewController.m
69919 bytes ./NCCallController.m
51350 bytes ./NCRoomsManager.m
45729 bytes ./NCSignalingMessage.m
41158 bytes ./NCChatController.m
39965 bytes ./NCNotificationController.m
36454 bytes ./NCDatabaseManager.m
35461 bytes ./NCSettingsController.m
33585 bytes ./NCExternalSignalingController.m
27288 bytes ./NCChatMessage.m
27107 bytes ./CallKitManager.m
26029 bytes ./AppDelegate.m
24280 bytes ./NCUserInterfaceController.m
22822 bytes ./NCPeerConnection.m
21917 bytes ./VoiceMessageTableViewCell.m
20073 bytes ./AddParticipantsTableViewController.m
19702 bytes ./ShareLocationViewController.m
15597 bytes ./DirectoryTableViewController.m
14789 bytes ./ObjectShareMessageTableViewCell.m
14301 bytes ./LoginViewController.m
12681 bytes ./RoomSearchTableViewController.m
12162 bytes ./NCChatFileController.m
10848 bytes ./UIBarButtonItem+Badge.m
10529 bytes ./CallParticipantViewCell.m
10268 bytes ./NCContactsManager.m
10016 bytes ./NCRoom.m
8832 bytes ./VoiceMessageTranscribeViewController.m
8379 bytes ./NCAppBranding.m
8118 bytes ./AuthenticationViewController.m
7894 bytes ./ScreenCapturer.m
7826 bytes ./NCChatTitleView.m
7411 bytes ./ChatTableViewCell.m
7251 bytes ./CCCertificate.m
6905 bytes ./NCMessageParameter.m
6785 bytes ./RoomTableViewCell.m
6719 bytes ./NCSignalingController.m
6709 bytes ./ReplyMessageView.m
6415 bytes ./NCAudioController.m
6284 bytes ./NCIntentController.m
6065 bytes ./NCPushNotification.m
5950 bytes ./NCRoomParticipants.m
5736 bytes ./SystemMessageTableViewCell.m
5608 bytes ./NCUserStatus.m
5578 bytes ./NCNotification.m
5553 bytes ./AutoCompletionTableViewCell.m
5367 bytes ./NCConnectionController.m
5090 bytes ./NCKeyChainController.m
4956 bytes ./ResultMultiSelectionTableViewController.m
4937 bytes ./QuotedMessageView.m
4725 bytes ./DetailedOptionsSelectorTableViewController.m
4535 bytes ./DirectoryTableViewCell.m
4435 bytes ./MapViewController.m
4400 bytes ./WSMessage.m
4326 bytes ./RoundedNumberView.m
4235 bytes ./SearchTableViewController.m
4105 bytes ./NCContact.m
4080 bytes ./NCUser.m
3849 bytes ./SocketConnection.m
3809 bytes ./ContactsTableViewCell.m
3385 bytes ./NCAvatarSessionManager.m
3309 bytes ./NCImageSessionManager.m
3226 bytes ./MessageBodyTextView.m
3112 bytes ./RoomDescriptionTableViewCell.m
2831 bytes ./GeoLocationRichObject.m
2823 bytes ./NCPushProxySessionManager.m
2744 bytes ./MessageSeparatorTableViewCell.m
2494 bytes ./VoiceMessageRecordingView.m
2436 bytes ./NCAPISessionManager.m
2347 bytes ./NCPoll.m
2338 bytes ./NCPushNotificationsUtils.m
2268 bytes ./BarButtonItemWithActivity.m
2267 bytes ./NCNavigationController.m
2252 bytes ./NCUserDefaults.m
2199 bytes ./AvatarBackgroundImageView.m
2074 bytes ./NCScreensharingController.m
2061 bytes ./NotificationCenterNotifications.m
1970 bytes ./PlaceholderView.m
1950 bytes ./RoomNameTableViewCell.m
1907 bytes ./ScreenCaptureController.m
1835 bytes ./HeaderWithButton.m
1662 bytes ./NCMessageFileParameter.m
1532 bytes ./NCWebImageDownloaderOperation.m
1507 bytes ./ABContact.m
1403 bytes ./NCMessageTextView.m
1281 bytes ./DateHeaderView.m
1232 bytes ./NCChatFileStatus.m
1214 bytes ./NCMessageLocationParameter.m
1202 bytes ./NCDeckCardParameter.m
1143 bytes ./NCChatReaction.m
1048 bytes ./FederatedCapabilities.m
1031 bytes ./main.m
1010 bytes ./ServerCapabilities.m
981 bytes ./TalkCapabilities.m
938 bytes ./TalkAccount.m
883 bytes ./NCChatBlock.m