- Add EcoreSerializerBase.createTemporaryFileURI() and use it to fix generation of PikeOS vmit.xml configuration files
- Adjust other configuration generators (in particular: test cases for configuration generators) that relied on writing to pre-existing resources in Eclipse bundles (which, however, only worked in the developer installation and never in the pre-compiled RCP)
- Hence, remove output placeholder files that are no longer required.
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- getReferencingResourceURIs(): Load side-car model resources via ResourceSet.getResource. This has the advantage that custom resource factories will be considered

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Ensure that IDs have been assigned to all new model elements before they are hooked to the project / resource
- Rationale
  - Model elements for which no ID has been assigned, have id 0 (which is the default value). 
  - When the new element is hooked to the resource, ResourceUtils.KernelResourceFactory.KernelXMIResource.getId() is called, which internally calls setId() to synchronize the XMI ID with the AF3 ID. In case the ID is still 0, this implicit call will corrupt the ID -> model object map (by override the mapping for key 0).
- Changes
  - ElementCompositorService: Assign IDs *before* hooking new element to the container (but of course using the container to determine the next free ID)
  - ModelElementCompositorBase: Assign IDs to newly instantiated annotations

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- This is expected to create the right bundle URIs when the code is executed from a deployed bundle (in an RCP)

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- getReferencingResourceURIs(): Ensure that all Exceptions are caught (including NoClassDefFound which might occur when old models should be deleted after a root class has been removed from the metamodel)

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- Scan the directory in which the AF3 project resides for external models that directly or indirectly reference the AF3 project resource.
- Note that this may be long-running operation which is why the work of the DeleteAction has been wrapped into an Job that provides an IProgressMonitor.

refs 2691

- Create a command on the command stack only if necessary (i.e., prevent models from being marked as dirty although they have not been modified)
refs 2691

- For reasons of consistency, and to avoid that "generated-src" directory is deleted by IDE dev tools' EcoreBuilder, start specification of directory for generated edit code with a '/' (just like the model, editor, and test code directories)
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