Changes

NEWT: Use accessors to read/write postion and size, allowing better trace and controlling autoPosition; Restrict more fields to private where possible.

WindowImpl's position and size is made private and accessed
by it's getter and setter (definePosition/defineSize).

This allows better tracing of value changes and ensures autoPosition is set to false.

NEWT/X11: Fix Insets determination for undecorated / child window.

Due to latest changes, a bug is disposed where the native 'updateInsets'
attempts to determine the window insets by it's parent window (fall-back).
The latter works only in case of a top-level window.

Adding query to the WM whether the window is decorated (top-level) or not.
Attempt to use the fall-back parent window method in case of a decorated window.

This whole inset code based on the parent window is probably completly redundant,
nevertheless we keep it alive until further notice.

UI Test / AWTRobotUtil: Relax and fix focus tests

- toFront*(..) uses the AWT Window focus state, instead of our AWTWindowFocusAdapter,
  which removes false negatives.
  Often the focus is already hold on the Window where no focus change
  will be recognized by our AWTWindowFocusAdapter.

- assertRequestFocusAndWait(..) recovers from lack of focus-lost event
  (if received focus-gained) and only dumps the case - returns success.

- Since assertRequestFocusAndWait(..) implicitly tests the passed
  FocusAdapter and relaxes the constraints (see above)
  no more post-call assertions on the FocusAdapter is being performed (removed).

- assertRequestFocusAndWait(..) is no more used on AWT Window or Frame,
  see 1st note above!

UI Test AWTRobotUtil's toFront*(): retry requestFocus() within loop.

NativeWindow/OSX: Fix Offscreen CALayer SIGSEGV @ Shutdown (Cleanup referencing)

- allocate CALayer w/ invoking init:
     [[CALayer alloc] init]

- attach CALayer to JAWTSurfaceLayer w/o autorelease:
     surfaceLayers.layer = layer; // already incr. retain count

- destroy CALayer @ JAWTWindow destroy

NEWT/OSX: Window close (release) on main thread, ensuring no 'main thread' event is pending

test scripts