Fix event AddHightligh and add event DelHighlight
Fix event AddHightligh and add event DelHighlight

lgeek/koreader,robert00s/koreader,Hzj-jie/koreader,apletnev/koreader,Markismus/koreader,NiLuJe/koreader,houqp/koreader,mihailim/koreader,pazos/koreader,NiLuJe/koreader,Frenzie/koreader,mwoz123/koreader,poire-z/koreader,koreader/koreader,poire-z/koreader,Frenzie/koreader,koreader/koreader