* properly done background backup service
* new concurrency/locking management with heartbeat
fix communication erros with Kotlin plugin on start/stop service methods
better error handling for BackgroundService public methods
Add default notification message when service is running
* configurable WiFi & charging requirement for service
* use translations in background service
* New features
- Share album. Users can now create albums to share with existing people on the network.
- Owner can delete the album.
- Owner can invite the additional users to the album.
- Shared users and the owner can add additional assets to the album.
* In the asset viewer, the user can swipe up to see detailed information and swip down to dismiss.
* Several UI enhancements.
* Update photo_manager pub package
* Added download endpoint for assets
* Successfully save a photo to the local device's gallery
* Save save a video to the local device's gallery
* Fixed#97
* Added download loading indicator
* Refactor and increase the font size for curated search thumbnail images
* Reposition loading animation on the search result page
