* Handle pause/restart listening to event on_upload_success and reload asset list after navigating back from BackupControllerPage
* Remove unused api endpoint
* Renamed multipart filed name 'files' to 'assetData'.
* Added an additional field name of 'thumbnailData' to multipart form.
* Implemented upload mechanism for thumbnail directly from the mobile client.
* Removed dead code
* Implemented a version checking mechanism.