- Update to 0.9.3:
  * herbstclient prints error messages always on stderr and normal
    output always on stdout (before, both were printed to the same channel).
  * True transparency support for frame and client decorations
    (requires a compositor like picom, compton, or xcompmgr)
  * Colors contain alpha-values (format #RRGGBBAA)
  * Do not draw frame background behind clients (so for semi-transparent
    client decorations, one does not see the frame decoration behind but the wallpaper instead)
  * New command line option '--replace' for replacing an existing window manager.
  * New command 'list_clients'.
  * The frame attributes ('selection', 'algorithm', 'fraction',
    'split_type') are now writable.
  * New objects for panels (under 'panels', exposing attributes
    'instance', 'class', 'geometry', 'winid')
  * The setting 'monitors_locked' is now explicitly an unsigned integer.
  * The setting 'default_frame_layout' now holds an algorithm name.
  * New client attributes:
    - 'floating_geometry' holding the client’s floating size (writable).
    - 'content_geometry' holding the geometry of the application’s content.
  * The 'shift' command now moves the window to a neighboured monitor if the
    window cannot be moved within a tag in the desired direction.
  * New command 'lower' to lower a window in the stack.
  * The 'cycle_value' command now expects an attribute (and only works for
    settings for compatibility).
  * New object 'types' containing documentation on (attribute-) types.
  * New command 'attr_type' printing the type of a given attribute.
  * New client alias 'last-minimized' and 'longest-minimized' for
    focusing and unminimizing minimized clients.
  * Relative values for integer attributes ('+=N' and '-=N')
  * The 'cycle' command now also cycles through floating windows.

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