Support for CDM v6.0, new build structure

This version adds support for CDM v6.0.

It also uses a new build structure, using Maven to handle dependencies on third party libraries. These changes were kindly provided by @blootsvoets for auditing and security reasons.

One important consequence is that the two applications now need to be started by running the appropriate scripts in the bin/ folder, as described in the README file of this repository.