- fixed launchers

- added branding for libgarcon, libxfce4ui, xfce4-notifyd
- obsoleted xfce4-desktop branding which is now provided by
xfdesktop-branding
- split up in subpackages xfce4-panel-branding-openSUSE,
xfce4-session-branding-openSUSE,
xfce4-settings-branding-openSUSE, xfdesktop-branding-openSUSE,
libgarcon-branding-openSUSE, libxfce4ui-branding-openSUSE,
xfce4-notifyd-branding-openSUSE

- temporarily removed menu again as it is currently provided by
libgarcon

- migrated panel settings to new format
- cleaned up menu