CAY-1916 cayenne-crypto module that enables data encryption for certain model attributes

* JceTransformer/JceTransformerFactory - in progress

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1583010 13f79535-47bb-0310-9956-ffa450edef68
CAY-1916 cayenne-crypto module that enables data encryption for certain model attributes

* JceTransformer/JceTransformerFactory

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1583021 13f79535-47bb-0310-9956-ffa450edef68
CAY-1916 cayenne-crypto module that enables data encryption for certain model attributes

refactoring: reducing the number of converters

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1583022 13f79535-47bb-0310-9956-ffa450edef68