Use the ui module for Australis and keep widget module as a fallback (#183)

Fix for #183.


It's full with debugging commands.
These CSS hacks should be improved. At least for the following:
 * `text-align`: it should be right for Widget, and default for Toolbar
 * the Toolbar doesn't attach seamlessly on WinXp, it has a light border on top which reveals the -1px top margin