[Inspector] Remove obsoleted inspector code
[Inspector] Show dialog through WindowManager

Use WindowManager, obtained via the platform,
to show the Save/Save All/Abort dialog. This
is preferable to the usage of static methods
in OptionBox, as was done previously, because
it is less Swing-specific (supporting
nasa/mct#155) and because it is easier to
verify in unit tests (WindowManager is an
interface and is easily mocked.)
[Inspector] Unit test for inspector
[Inspector] Unit test for view switcher
[Icons] Deprecate getSelectedIcon
[Icons] Remove reference to deprecated getSelectedIcon

Now that icon buttons are not used, getSelectedIcon
is deprecated in ViewInfo. Remove reference to
this from PanelInspector. Note that this inspector
still needs revision to use the View Switcher
[Inspector] Test method added to abstract housing

setHousedViewManifestation has been added to
ViewProvider. MCTAbstractHousing implements
this as a no-op which returns false, so that
its subclasses don't need to worry about it
unless they want to.
[Inspector] Use view switcher in canvas inspector