Squashed commit of the following: apps/graphics/twm4nx: Revamp the event system to support notification of external applications when the window is being closed. apps/graphics/twm4nx: A little NxTerm progress apps/graphics/twm4nx: Clean up some logic associated with use of multiple Icon Managers. apps/graphics/twm4nx: Add CNxterm to the build. It is a long way from compiling.