#10: add final to instance variable
#10: LoadDataReverse enabled as default for ReplaceSchema first data
#10: migrate DTD to org.dbflute
#10: avoid IntelliJ lambda compile error
#10: adjust relation null object, add resolved variable
#10: fix snapshot
#10: prepare column null object implementation, add many todo
#10: small fix
#10: remove Scala dist for now, until support Scala