NEWT/AWT Focus Traversal / Deadlock Fix (Windows) ; Harmonized NEWT KeyListener handling (Bug 526)

NativeWindow:
  - expose 'hasFocus()'

Window:
  - 'protected enqueueRequestFocus(..)' -> 'public requestFocus(boolean wait)'

  - New: 'setKeyboardFocusHandler(KeyListener)' allowing focus traversal co-op w/ covered TK (AWT)

WindowImpl:
  - Impl Window changes (see above)
  - Impl 'consumedTag' see commit 3b38957f36d4f89b85730755a41c00892ac70591

NewtCanvasAWT:
  - FocusAction only removes the global AWT focus owner.
    This fixes a deadlock on the Windows platform of AWT's native peer requestFocus impl,
    since it's no more called at this point.

  - NEW FocusTraversalKeyListener is set as the newtChild's KeyboardFocusHandler,
    allowing traversal to the next/previous AWT component.

AWTParentWindowAdapter:
  - focusGained(..) clears AWT focus and propagates focus to Newt child,
    non blocking w/ 'requestFocus(false)' (see above)

KeyEvent:
  - Document limitations of getKeyChar() (Bug 526)

MacWindow:
  - only deliver keyChar on key Typed events, harmonizing platform behavior (Bug 526)

WindowsWindow:
  - regenerate the keyCode for EVENT_KEY_TYPED (Bug 526)

X11Windows:
  - complete keyCode mapping X11 -> Newt - X11KeySym2NewtVKey()
  - only deliver keyChar on key Typed events, harmonizing platform behavior (Bug 526)

Tests:
  - GearsES2: Make focus visible
  - TestParentingFocusTraversal01AWT: unit test for keyboard focus traversal w/ NewtCanvasAWT

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