* Allow filtern events-ressource on API by attrs
* Document meta-data attr-filter for order resource
* Actually document the change and not some random other nonsensical thing...
* Doc for subevent-filtering
* Test for attr-filtering on events resource
* Allow attr-filtering on subevents
* Add attr-filter test for subevent
* Update doc/api/resources/subevents.rst
* Update src/tests/api/test_subevents.py
* Update doc/api/resources/events.rst