Improve internals of png composition in xfwm4
Prepare support for icons in xfwm4 (not quite there yet)


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- Modify xfwm4 to be compatible with the gtktoxevent API change (make sure you update both libxfcegui4 *and* xfwm4 at the same time!)
- Code cleanup in xfwm4; move global variables in a dynamically allocated structure.


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Get rid of out own Xinerama impl. and use GdkScreen routines instead (that fixes at least two issues I can see ,the requirement to have Xienrama enabled in libxfcegui4 to get support for in in xfwm4, and as a side effect, xfwm4 is now compatible with SUN Xinerama which is slightly different from XFree Xinierama)
Add a new theme, from my numerous attempts to deign a default xfwm4 theme for 4.2
Remove the theme "synthetic" that sould be moved to xfwm4-themes package


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Huge code reorg., add preliminary support for partial struts; it still needs work but it safer to commit to SCM now than loosing the code later, heh!


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Add preliminary support to net_wm_user_time to avoid focus stealing, I don't if that's exactly what we want, though.


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