TouchMenu: add swipe south to go back to parent menu
TouchMenu: add swipe south to go back to parent menu

Frenzie/koreader,NiLuJe/koreader,NiLuJe/koreader,Frenzie/koreader,poire-z/koreader,poire-z/koreader,koreader/koreader,koreader/koreader