Signal-Android-v-7.8.1

feat(chat, notification and security): Add selective SignalJW Features

- Choose between passphrase protection and the Android screenlock
- Option to treat view-once media as normal media
- Option to ignore remote deletion
- Choose between FCM or websocket notification delivery
- Option to delete only the media from a message, not the rest of the message
- Added options to select who can add you to a group

Co-authored-by: Johan <johanw@xs4all.nl>