Gtk UI: added option --no-csd to disable client-side decorations

 * many WMs like Unity or even Awesome WM have problems with client-side
   decorations.
   Awesome WM for instance does not allow us to move or resize
   floating windows with CSDs. Also, the added close button does
   not make sense for tiling window managers and since they usually
   never show window title bars, CSD brings no advantages at all
   on tiling window managers.
 * Other window managers might not support CSD at all.
 * There is AFAIK no way to detect whether CSDs will be possible
   or whether there will be glitches (see Awesome).
 * Added command line option --no-csd in the --help-gtk group.
   This can be added to desktop shortcuts etc. Later there might
   be better ways to configure stuff like that, e.g. when we add
   support for scripted UI customizations.

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