Add AASX reading and writing functionality

Michael Thiesrequested to merge
feature/aasx into master

This MR adds the adapter.aasx module with AASXReader and AASXWriter classes to read and write .aasx files according to DotAAS section 7. Fixes #38 (closed).

It also adds/changes some core functionality to make this possible (or make testing easier):

  • New module aas.util.traversal for traversing AAS object structures
  • Improved DictObjectStore.__init__()
  • Fixing paths in test.compliance_tool for unixoid systems
  • Add Submodel references for identification and BOM submodels to Test_AssetAdministrationShell in examples.data.example_aas

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