Changes

Bug 1232 - NEWT Translucent Decorated Windows Not Working On Windows >=
8 (Lack of Aero / Blur )
Adopting new undocumented user32.dll Windows >= 8 API:
 - SetWindowCompositionAttribute / AccentState
See:
 -
<https://github.com/riverar/sample-win10-aeroglass/blob/master/MainWindow.xaml.cs>
 -
<http://withinrafael.com/adding-the-aero-glass-blur-to-your-windows-10-apps/>
 -
<http://undoc.airesoft.co.uk/user32.dll/SetWindowCompositionAttribute.php>
 -
<http://undoc.airesoft.co.uk/user32.dll/GetWindowCompositionAttribute.php>
+++
Cleaning up WindowsDWM.h, use on header file (in stub_includes) for
GlueGen and implementation.
+++
Merge java implementation within GDIUtil.DwmSetupTranslucency(..), to be
utilized by NEWT and JOGL.
NEWT issues GDIUtil.DwmSetupTranslucency(..) at creation and when
toggling decoration.
Toggling decoration on Win >= 8 leads to lost of translucency when
returning to decorated window. On Win 7, this may work .. but is also
buggy.
+++
Followup patch is needed for NEWT to _not_ clear the background!

Bug 1205: Revert clear background to support fix for Bug 1232: NEWT
Translucency Windows >= 8
Reverting 'clear backrgound' portion of commit
f607c0148736fa198fb91b60123824e53366022e. It has been identified, that
Windows does initialize onscreen windows (i.e. w/ white/DESKTOP color).
This is also required for allowing translucent windows, since clearing
the background intefers on Windows >= 8 (undecorated windows).