Features:
* added offboard global pos global altitude and altitude terrain (1626).
* Offboard pos global (1620).
Bugfixes:
* mission: fail if mission item is unsupported (1634).
* Fix battery voltage (1621).
* Fix failure enums (do not cast enum values directly) (1619).
* mission: fix jsoncpp cmake (1613).
Enhancements:
* takeoff_and_land: fix plugin(i)s typo (1635).
* mission: remove TRIGGER_CONTROL (1632).
* core: only request autopilot version if autopilot (1631).
* Use modern numeric limits (1623).
* Do not cancel SITL jobs in CI, even if another one failed (1622).
* core: add SystemImpl::make_command_ack_message() method (1617).
Contributors:
dlech, JonasVautherin, julianoes, MaEtUgR, romain-chiap, slaghuis