add vertically scrollable text widget
add vertically scrollable text widget

mihailim/koreader,Hzj-jie/koreader,NickSavage/koreader,noname007/koreader,chrox/koreader,Frenzie/koreader,chihyang/koreader,apletnev/koreader,lgeek/koreader,houqp/koreader,NiLuJe/koreader,pazos/koreader,NiLuJe/koreader,ashang/koreader,poire-z/koreader,ashhher3/koreader,mwoz123/koreader,Frenzie/koreader,frankyifei/koreader,Markismus/koreader,poire-z/koreader,koreader/koreader,koreader/koreader,robert00s/koreader