[UX] ReaderGesture: add option - toggle rotation
[UX] ReaderGesture: add option - toggle rotation

Hzj-jie/koreader,NiLuJe/koreader,Frenzie/koreader,poire-z/koreader,koreader/koreader,pazos/koreader,houqp/koreader,Markismus/koreader,poire-z/koreader,mihailim/koreader,mwoz123/koreader,Frenzie/koreader,NiLuJe/koreader,koreader/koreader