GUI changes, currently broken, stashing on this branch.
Convert from ribbon to AUI; this works better
Instead of trying to use a ribbon bar, now using an AUI Toolbar (and overall AUI window manager) for the core browser. Next steps are getting things set up properly on startup (so core/view/filter are already selected, and persistent), moving the wall of buttons, and using the "what's being displayed" statusbar-like item to better effect...
Merge commit.