GUI: rename methods returning item

Mikhail Svechnikovrequested to merge
i372 into main

Methods that return an item now contain "Item" in their names. Other methods working with the same item may not have this, for example

InstrumentItem* instrumentItem();

but

void setInstrument(InstrumentItem* item);

Methods returning SelectionProperty also have appropriate ending:

SelectionProperty<FormFactorItemCatalog>& outerShapeSelection();

This resolves #372 (closed)

Edited by Mikhail Svechnikov

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