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

* switching the framework to BytesDecryptor/ByteEncryptor
* a concept of default Key

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1584631 13f79535-47bb-0310-9956-ffa450edef68
CAY-1916 cayenne-crypto module that enables data encryption for certain model attributes

* builder cleanup
* fixing tests

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1584632 13f79535-47bb-0310-9956-ffa450edef68
CAY-1916 cayenne-crypto module that enables data encryption for certain model attributes

* builder cleanup
* fixing tests

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1584634 13f79535-47bb-0310-9956-ffa450edef68