gems: nit_fader
gems: add include/gems/animator.h

The utility for animating GUI elements was formerly private to
'app/decorator'.
gems: move reusable wm headers to include/gems
gems: add gems/wrapped_nitpicker_session.h

The 'Wrapped_nitpicker_session' contains the boiler-plate code that is
needed when virtualizing the nitpicker session interface.
gems: new menu-view application

The menu view generates a simple dialog of widgets and reports the
hovered element. It is meant to be embedded into applications that
require simple GUIs but don't want to deal with the pecularities of
a full-blown widget set.
gems: launcher application