launcher-gtk: Add horizontal wrap toggle button
launcher-gtk: Add horizontal wrap toggle button

https://bugzilla.gnome.org/show_bug.cgi?id=577597

GNOME/libchamplain,StanciuMarius/Libchamplain-map-wrapping,StanciuMarius/Libchamplain-map-wrapping,StanciuMarius/Libchamplain-map-wrapping,GNOME/libchamplain,StanciuMarius/Libchamplain-map-wrapping,StanciuMarius/Libchamplain-map-wrapping