Revert "Remove unused 'xfce_gtk_menu_append_seperator' (#49)"

Merged Gaël Bonithon requested to merge Tamaranch/libxfce4ui:readd-append-seperator into master

This reverts commit 08076f48 and hides xfce_gtk_menu_append_seperator() in the doc.

Fixes: #69 (closed)

Edited by Gaël Bonithon

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