get rid of XmlSerializer for NumberingDocument
start working on CT_Comments
CT_Comments checkin 2
implement some parsers in formats
support generate Items code
generate Parse and Write methods for Items object
XWPF gets rid of XmlSerializer now
enhance codegenerator to support Items and ItemsElementNames
fix serialization issue by testing real cases

solve ST_OnOff and CT_OnOff serialization issue
Merge branch 'xwpf-refactoring'