Add duplicate button in switchCase component property lists

[fietser28]

This is just a convenience request:

There are several places where I think a duplicate button would be very nice to have. Especially in the switchcomponent:

Here I would like to have a 'duplicate' button next to the delete/trash button of the list of the individual case statements. In many cases the case statements have a very repetitive character (just like in this example). Now I have to fill them all in from scratch individually.

The switchcase component is (to me) the most important one, but this might also apply to setVariable and input/output edit lists.