gui: references: Highlight symbol row when reference is selected
instruction view: Handle (partially) row activation

Doesn't actually go to the other method, and doesn't handle data etc.
gui: Refactoring: Break out symbol view/references view to a class

A bit ugly, but workable.
gui: Refactor symbol selection handling, navigate to sym on activation
unit test: Jump target display: Correct fillLanes test, improve printout
unit test: XmlString: Change fixture name to avoid linking issue

For some reason it otherwise clashes with XmlFactory::ListenerFixture...
unit test: XmlString: Clear string after each test (multiple insns)

There is another issue as well: The order of registring is important
in order to handle the XML string correctly...