Bug / moddability frq: allow blueprints to directly specify icons for pet selection menu

[kernelmethod]

Widget-based pets (e.g. either / or, Lorent Epsome, a network of roots) currently use the default * icon in the new pet icon menu, rather than icons that are representative of the pets themselves.

For modders (and for the purposes of fixing this bug) it would be nice if QudCustomizeCharacterModuleWindow supported a tag on object blueprints that allowed you to choose the icon that is displayed in the pet selection window, e.g.

<tag Name="PetSelectionIcon" Value="pet_icon_filename.png" />

‌