* add options to `import_via_symlinks`, `skip_duplicates` and `resync_metadata`
* checks added to avoid conflicts between `delete_originals` and `import_via_symlinks` (the former takes precedence)
* `resync_metadata` only available if `skip_duplicates`

* passing `resync_metadata` setting to server was missing
* prevent code smells by introducing selector constants
* remove unused CSS specification

* cleanly abort import process on server
* ESC button cancels import during process and closes modal panel after import has finished
* more robust implementation for scrolling rows to bottom in import panel (hardcoded row height removed)

* save button at bottom of full settings page closes settings, while leaving sidebar open.
* save using Enter key stays on settings page.

Enable cancelation for local uploads as well

Add visual feedback on cancelation