Refactore serialization of processes

[andiikaa]

At the moment, for all model-classes which should be serialized with JSON, exist additional classes.
We have to copy all infos from model-objects to these JSON-objects for serialization and from JSON-objects to model-objects for deserialization .

If the model has a nice design, the JSON-classes are no longer necessary.

There are also some workarounds for the editor in serialization, since it is a OSGi project, the jackson classloader does not see the JSON-classes in the process.util package.

https://stackoverflow.com/questions/19724312/jackson-deserializing-custom-classes-in-an-osgi-environment