Removes SubmodelDescriptors from AssetAdministrationShell

- Fixes AASModelProvider to be able to modify sm references
- VABMultiSubmodelProvider now synchronizes submodel references
- Fixes examples

Change-Id: I23c5c5f95076b92a3aaaaf80cf99cef0d41178b7
Signed-off-by: Daniel Espen <daniel.espen@iese.fraunhofer.de>
15 files changed