implement backup and restore draft 1

+ add extra fields for backup in favorites and scrobble data
- not yet for the playlist tracks

app/api/__init__.py

@@ -31,6 +31,7 @@ from app.api import (
     getall,
     auth,
     stream,
+    backup_and_restore
 )
 
 # TODO: Move this description to a separate file
@@ -107,6 +108,7 @@ def create_api():
         app.register_api(settings.api)
         app.register_api(colors.api)
         app.register_api(lyrics.api)
+        app.register_api(backup_and_restore.api)
 
         # Plugins
         app.register_api(plugins.api)