apps/graphics/twm4nx: Revise logic to detect clicks on the background image. The original implementation had some side effects.
apps/graphics/twm4nx: Remove some remaining, unused stuff from TWM that was never used. Menus need to close after the 'terminal' selection is made. Otherwise, the menu can become buried under a newly open menu and not easily recovered.
apps/graphics/twm4ndx: Add a 'critical' bit to the eventID. While resizing, all events will be ignore except those marked critical.
apps/graphics/twm4nx: CBackground now brings up the main menu if the background image is click. This makes the behavior the same across all of the background except when an icon is clicked.
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