Refactoring #1484

Updated by pospelov over 2 years ago

* Introduce DetectorContainerItem
* introduce common base DetectorItem for SphericalDetectorItem and RectangularDetectorItem
* move domain detector/instrument generation on board of corresponding items
* move MaskContainer ownership to detector items

* Change ComboProperty: it should store the whole list of available strings.
> Take care of ComboProperty during serialization across the whole project
** It will automatically resolve #1637

* Refactor JobItem::JobItemHelper in the context of IntensityData serialization (ComboProperty with units)

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