GUI refactoring: rename "seItem" method of SessionItemWidget derivatives

Mikhail Svechnikovrequested to merge
setItem_rename into main

SessionItemWidget derivatives can store SessionItem object, obtained in setItem(SessionItem* item).

In order of making child classes more independent, with more specialized methods, their setItem method was renamed to make the purpose of the function clearer: setJobItem, setIntensityItem, setAxisItem etc.

This was only done if seItem method of these classes was used explicitly, not from upcasted pointers.

Edited by Mikhail Svechnikov

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