* Enhancement: add hook support for event changes+deletion hooks (initial support: "rabbitmq")
* Dependency: pika >= 1.1.0
* Enhancement: add support for webcal subscriptions
* Enhancement: major update of WebUI (design+features)
* Adjust: change default loglevel to "info"
* Enhancement: support "expand-property" on REPORT request
* Drop: support for Python 3.7 (EOSL, can't be tested anymore)
* Fix: allow quoted-printable encoding for vObjects