Code Generator for Eclipse Code

Fixed some issues with the model generation introduced by the change to version 2.0 in the serialisation

Completed Test and fixed errors that occured.

Set the correct schema file to validate against

Refactoring after the renaming of the constant classes. This conclude #91

Rename the class

Refactered the constant interfaces into final classes

completed the integration of the serialisation in version 2 in the UI

Upgrade to new serialisation version

Updated schema definition to conform to the new serialisation form

Use the primary constraint in the model if it is defined as such in the metadata