Changes

Bug 907 - Add native Windows test sending WM_GETTEXT to all windows and dumping the result. If working, Bug907 is fixed and hence DDT is working.

GLJPanel.initializeBackend(offthread=true): Enable on Windows, thanks to Bug 907 impl. DummyDispatchThread (DDT)

Bug 907 implemented DDT used to create and destroy offscreen surface's dummy drawable on Windows.
This enables offscreen initialization on Windows running from a short lived arbitrary thread.

Bug 914 - Don't allow 'alwaysontop' in fullscreen mode, always allow switching to other applications via ALT-TAB

As described @ <http://forum.jogamp.org/Regression-of-alwaysOnTopBug-tp4030735p4030738.html>,
we shall not steal the desktop in fullscreen mode via 'alwaysontop'.

Latest tests on X11/GNU/Linux and Windows7 - before this patch:

With default settings, i.e. alwaysontop (atop) disabled,
it works as expected here, i.e.:
  - ALT-TAB triggers WM dialog, switching between apps.
  - ALT-TAB can actually switch to other apps.

However, with enabled atop:
  - ALT-TAB triggers WM dialog, switching between apps.
  - ALT-TAB does _not_ switch to other apps. (*)

I consider this a serious issue, since we shall not steal
the desktop in fullscreen mode.

This patch disables atop in fullscreen mode,
i.e. (*) will switch to other apps again!

Bug 914: Newt OSX: Don't use exclusive fullscreen mode (captured display) in favor of proper WM incl. ALT-TAB app-switching

NEWT Windows: Rearrange wndProc switch-case: All key/mouse events shall be at last

Bug 916 - NEWT Fullscreen Mode on Windows ALT-TAB doesn't allow Application Switching

Remedy for 'some' display drivers, i.e. Intel HD:
  Explicitly push fullscreen window to BOTTOM when inactive (ALT-TAB)