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

a concept of Encryptor
precompiling Encryptors for batch query execution

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1582630 13f79535-47bb-0310-9956-ffa450edef68
CAY-1916 cayenne-crypto module that enables data encryption for certain model attributes

encryptor implementation

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1582631 13f79535-47bb-0310-9956-ffa450edef68