[osg-submissions] osgViewer/X11: fix for stuck-keys bug

[Melchior FRANZ]

Here's a new version with the following changes made:

- be a bit more pedantic about modifier settings for
  artificially pressed/released keys
- fix a compiler warning
- simplification & minor improvements


attached:

   ./src/osgViewer/GraphicsWindowX11.cpp
   ./include/osgViewer/api/X11/GraphicsWindowX11
 
m.
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