Crypto: encrypt/decrypt, move cryptopp to implementation, tests.

Note: ECDH and ECDHE key exchange are still under development. I would like these schemes to be reviewed however encrypt/decrypt is primary focus; ECDH-related classes and tests will be removed along with ECKeyPair prior to merge.
The name of the class suggests that it can perform the whole protocol, but I would assume it performs only a small part of it.