#186: common utils for moving settings to preferences

api/funkwhale_api/common/preferences.py

+from django.conf import settings
+from dynamic_preferences.registries import global_preferences_registry
+
+
+class DefaultFromSettingMixin(object):
+    def get_default(self):
+        return getattr(settings, self.setting)
+
+
+def get(pref):
+    manager = global_preferences_registry.manager()
+    return manager[pref]