Fix NEWT/AWT WindowClosing Unit Tests ; Review/Cleanup NEWT WindowClosing mechanism

Due to a NEWT WindowClosing event regression cause by NewtCanvasAWT changes
a review of our WindowClosing event mechanism was required.

Important cleanups are marked w/ '(*)' below.

I would have preferred to change the 'WindowListener.windowDestroyNotify(WindowEvent)'
method to pass a WindowCloseEvent object exposing more information like
toolkit or programmatic destruction and passing whether a 'closing' or 'nop' action
will be performed based on the WindowClosingMode.
For now I postponed this idea .. since it would change the API again,
but may reconsider it after merging the Android 'closing' patch.

- InputEvent.consumedTag -> NEWTEvent.consumedTag

- Window
  - (*) Promote setWindowDestroyNotifyAction(Runnable) to public,
        former WindowImpl.setHandleDestroyNotify(boolean).
    Using a Runnable action for WindowImpl.windowDestroyNotify(boolean)
    allows a setting defined alternative for destroy() and gets rid
    of [ab]using WindowListener.windowDestroyNotify(WindowEvent) for
    lifecycle actions. Used in:
      - GLWindow
      - GLAutoDrawableDelegate impl.

- WindowImpl
  - Respect NEWTEvent.consumedTag for WindowEvents as well

  - (*) Impl. setHandleDestroyNotify(boolean) (see above)

  - (*) destroy() simply sends out pre- and post- destruction Window events,
    where windowDestroyNotify(boolean) sends out the pre-destruction event if NOP.

  - (*) windowDestroyNotify(boolean) is public now, allowing other impl. details
    to follow proper destruction using handleDestroyNotify Runnable (-> NewtCanvasAWT).

- AWTWindowClosingProtocol:
  - addClosingListenerOneShot() -> addClosingListener()
    - calling addClosingListener() at addNotify()
    - calling removeClosingListener() at removeNotify()

  - AWTWindowClosingProtocol ctor taking NOP runnable,
    allowing to send WindowEvent.EVENT_WINDOW_DESTROY_NOTIFY at WindowClosingMode.DO_NOTHING_ON_CLOSE

  - add/remove listener on AWT-EDT

- AWTWindowAdapter
  - Add 'removeWindowClosingFrom(..)',
    allowing to remove window closing event fwd.

  - Also fwd windowClosed in window closing fwd'ing.

- NewtCanvasAWT
  - (*) Utilize AWTWindowClosingProtocol NOP runnable (see above)
    to fwd closing-NOP event to NEWT

  - (*) Unify remove/destroy code in destroyImpl(..)
    - !removeNotify -> destroy NEWT child programatic or as toolkit event
    - removeNotify || windowClosing -> destroy jawtWindow

  - (*) Remove AWTWindowAdapter/AWTParentWindowAdapter's windowClosingListener,
    since we utilize AWTWindowClosingProtocol

- DisplayImpl
  - Adding 'final void dispatchMessage(final NEWTEvent event)'
    allowing to remove the NEWTEventTask wrapping for no reason
    in enqueueEvent(..) if on EDT and waiting.

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