- Support sharing the ResourceSet used to load models managed by the kernel...

- Support sharing the ResourceSet used to load models managed by the kernel with additional model files (e.g., models, that are linked to the model managed by the kernel using IDs)
  - Save all resources in the ResourceSet when the model managed by the kernel is saved
  - Update ResourceSet when file used to persist Resource not managed by the kernel is removed from the file system
refs 2309