v0.1.1

Merge pull request #394 from twonlyapp/dev

- New: Groups can now collect flames as well
- New: Background execution to pre-load messages 
- New: Adds a link if the image contains a QR code
- Improve: Video compression with progress updates
- Improve: Show message "Flames restored"
- Improve: Show toast message if user was added via QR 
- Fix: Media file appears as a white square and is not listed.
- Fix: Issue with media files required to be reuploaded
- Fix: Problem during contact requests
- Fix: Problem with deleting a contact
- Fix: Problem with restoring from backup
- Fix: Issue with the log file