refine some event, remove bookAdded,deleted,updated event ( what is the spec for these event? should add back when you have spec)
refine chart impl for user action handler
fine tune header event/command
refine  event from book in spreadsheet
implement picture upload, update zkversion to 6.5.3 fl for fileupload feature,
refine sheet validation api in spreadsheet component
ZSS-268	get exception if I listen to onValidateDrop, also rename onFilter -> onCellFilter, onValidateDrop -> onCellValidation
Merge branch 'origin/3.0'