Internal datatype of tinia::model::gui::ComboBox

[jnygaard]

Problem: ComboBox entries appear in a different order in the GUI than what was specified in the code setting up the GUI element.

Possible solution: Maybe we should change this from Hash/Map/...? to some sort of list. Currently, the contents of the ComboBox in the GUI is listed in a seemingly random order. The order is consistent across rebuilds, but bears little resemblance to the order in which the elements were specified during construction. (It could be that the order is reflected in the way some internal tree is being built for the list entries.)

May also affect radiobuttons and similar GUI elements.

[kjetilly]

This is a fundamental issue relating to how RestrictionSet is stored in a restricted element(i.e. not in the GUI but in the ExposedModel). Should be simple to fix.