Allow exporting/importing models from/into CDO

[seiferma]

We only provide access to the plain models via the model-gen export. This feature is, however, restricted to the most recent version and overwritten after every change in the repository. The user should be able to export a selected model including related diagrams into a selectable location. The user should be able to import such exported models and diagrams again.

The features to be developed are

• Creating import and export wizards
• Reusing the model-gen code to export models and diagrams
• Reusing the ModelCreator code to import models into existing Cooperate project
  • Prohibit name collisions
  • Load the graphical diagrams
  • Execute transformations G2T for each diagram
  • Save artifacts to repository

[joehen]

The CDO ImportResourceAction and ExportResourceAction might be a good starting point., however, the export didn't seem to work properly...