GUI: interfaces and argument types: DoubleDescriptor ---> DoubleProperty

Interfaces of accepting functions are changed from DoubleDescriptor to DoubleProperty. Not everywhere, so one more MR will continue this work.

Steps of Descriptor refactoring:

1. reduce usage of functional pointers set() and get() of DoubleDescriptor
2. move Descriptor functionality to Property
3. use Property instead of Descriptor
4. remove Descriptor from code
5. refactor serialization of Property
6. replace Property macro definitions like DOUBLE_PROPERTY(intensity, Intensity) by explicit member with setter and getter

This MR does 3 for DoubleDescriptor

GUI/Model/Model/ParameterTreeUtils.cpp

@@ -228,8 +228,7 @@ void ParameterTreeBuilder::addInterference(ParameterLabelItem* layoutLabel,
         auto* dfLabel = addLabel<Profile2DItemCatalog>(label, "Decay function", df);
         for (const auto& d : df->valueDescriptors())
             addParameterItem(dfLabel, d);
-    } else if (auto* itf =
-                   dynamic_cast<InterferenceFinite2DLatticeItem*>(interference)) {
+    } else if (auto* itf = dynamic_cast<InterferenceFinite2DLatticeItem*>(interference)) {
         // domainSize1 and domainSize2 are of type UInt (not matching the double approach for tuning
         // and fitting). In BornAgain 1.18 these values have not been added to the tuning tree, and
         // also not to the fitting parameters. Maybe this should be necessary, but for now this