unify upgrade logic of different serialization format
added Upgradechecker to confirm if Omodel classes has upgraded to newest; not sure if it works, however
added adapter for legacy omodel (de)serializer to cooperate with new omodel. need testing
fixed bug of upgrade2newest and check if it's newest
improved MigrationTest; change default serialization to JAVA
failed experiment to use Bean(De)serializerModifier
progress in get rid of settless properties to void jackson-databind issue 501
Removed unnecessary code of jackson SerializerModifier. Removed deps to custom jackson-bind fork