(This was sufficient for basic interoperation, e.g. DM<->realizer)

Made ipaaca-java compatible with ipaaca-python's JSON datatypes. No JSON support on the Java-side though.

fixed overlapping InputBuffer constructors and added BufferConfiguration and BufferConfigurationBuilder

Added ipaaca channel possibilities based on rsb scope. Also, deprecated incompatible InputBuffer constrcutors for non-container parameters for multiple categories, from cpp version

- fixed typo in ipaaca documentation

- made sure the initializer is only initialized once
- toString methods for payload and localIU

- Minor cleanups

Defaults from /etc/rsb.conf and ~/.config/rsb.conf were falsely erased, fixed.

Implemented retraction handler. Replaced deprecated converter repository call.