Changes

Bug 672 (NewtCanvasSWT ignore windowing offset on OSX').
The NewtCanvasSWT is now brought into place by the parent SWT Composite
and the super SWT Canvas it extends. Also added two test cases. One with
a simple SashForm and the NewtCanvasSWT in the second cell, and another
with the NewtCanvasSWT in a Composite, that Composite now in the second
cell of the SashForm. The second test is necessary because the
NewtCanvasSWT does not receive SWT.Resize events in this configuration,
but only SWT.Paint ones (a behaviour inherited from the super SWT
Canvas)

Bug 672: Move Unit Tests to appropriate SWT package and prepent Test so they get picked up by our unit test run

Bug 672 (NewtCanvasSWT): Reuse SWTAccessor.isOS_TYPE ; Impl NW.getLocationOnScreen(..) for X11 and Windows ; Allow unit test to run on all platforms.

- Reuse SWTAccessor.isOS_TYPE (public now)

- Impl NW.getLocationOnScreen(..) for X11 and Windows reusing existing native code

- Allow unit test to run on all platforms.

Note: NewtCanvasSWT unit tests require a 'wait for realized' while SWT dispatching.
Otherwise the 'sash unit test' will fail since realiziation happens later, at least on X11.

Hence extended AWTRobotUtil.waitForRealized(..) to use a 'waitAction'
which is used here w/ special SWT dispatch Runnable.

AWTRobotUtil.waitForRealized(..) operates on time-delta instead of iteration-counter,
allowing above 'waitAction' Runnable.

AWTRobotUtil.waitForRealized(..) removed 2nd 'glad.isRealized()' loop ..

Workaround Bug 910 (IcedTea-Web): NewtCanvasAWT shall postpone JAWTWindow destruction via explicit set flag.

IcedTea-Web_1.5pre+rbc73a1362e9c still issues NewtCanvasAWT.removeNotify()
before before Applet.destroy(), i.e. removes NewtCanvasAWT from the Container
ahead of time (Applet protocol destroy()).

However, it fixes the non AWT-EDT issue, i.e. calls NewtCanvasAWT.removeNotify()
from the actual AWT-EDT - good.

Since the root cause still exist, we cannot use heuristics as described in
Bug 910 comment 9, but need to set a flag in NewtCanvasAWT to skip JAWT destruction
and remove it latter within Applet.destroy().

NewtCanvasAWT.removeNotify.0 - isApplet true @ [AWT-EventQueue-0, isAWT-EDT true]