xfwm4 theme reorg
I finally took some time to reorganize the theme stuff in xfwm4 for Xfce 4.2.
Theme are now located in themes/theme name/xfwm4 instead of xfwm/themes/theme name as in xfce 4.0
This means that older themes placed in the older location won’t be seen by xfwm4.2. This breakage was necessary to be consistent with the standard.
I also moved most themes from xfwm4 package to xfwm4-themes. That should make xfwm4 archive a bit smaller (and help keeps things clean)