cleanup of the AES encryption API and EncryptionCapsule
further encryption refactorings [still in progress]
encryption refactoring:
- unified AES and RSA encryption and decryption
- simplified object serialization and deserialization
- redistributed encryption responsibilities
EncryptionUtil API cleanup finished
added API for stream encryption and decryption
stream APIs updated
FileEncryptionUtil API clean-up finished
Merge branch 'encryption'

Conflicts:
	org.hive2hive.core/META-INF/MANIFEST.MF
	org.hive2hive.core/plugin.xml
Merge branch 'master-seppi'