Fixed a bug in PickAndPlaceService where the canDoStep() method would return true while parameters are missing.

The moveToSafePlane() method in the DeltaRobotModule now calls moveZ() with the appropriate offset instead of doing exactly the same as moveZ().
Merge branch 'development' of https://github.com/hesselmeulenbeld/HUniversal-Production-Utrecht into development
Fixed a minor bug in ProductionDurationResponse