GUI: change data items signaling in IntensityDataPropertyWidget

Merged Mikhail Svechnikov requested to merge i88g into main

IntensityDataPropertyWidget now works with the Qt signals, emitted by DataItem, IntensityDataItem and axes items.

The old mapper system is hold for a while, it can be switched using USE_MAPPERS macro definition.

Currently the code looks less concise and more ugly than before due to the code duplication (mappers/signals). Also the access of SessionItemWidgets to the JobItem is done in ad hoc manner and should be refactored.

Edited by Mikhail Svechnikov

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