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-253: allow user associate comp. with spreadsheet.
ZSS-268	get exception if I listen to onValidateDrop, also rename onFilter -> onCellFilter, onValidateDrop -> onCellValidation
Merge branch 'origin/3.0'
#ZSS-253:
 * change ZSS partner flag name
 * fix partner is blur but spreadsheet is still focus issue.
Merge branch 'ZSS-253' into 3.0
Incomplete - task : ZSS-253
finetune for filter command and event
Merge branch 'origin/3.0'
ZSS-253: can't resolve the focus from partner to non-partner issue now.
So, rollback the code.
make widget ctrl key handling become event-base, and move default handling logic to user action handler.
replace geting hidden row, column API with 3.0 API
remove onZSSAuxAction, use onAuxActionDirectly
replace incorrect "xsheet" to "sheet"
add a data validation setting with empty criteria