Struct support - vspec2graphql

[erikbosch]

This issues concerns struct support for vspec2graphql.

Required work:

• Define/propose how it shall be handled (possibly in this PR)
• Implement and test
• Make sure that expected output format is described in documentation
• If feasible, add at least one test case checking output

VSS Struct support is expected to be officially released for VSS 4.0, late April. To identify and manage remaining a work number of issues have been created to facilitate more detailed discussion and to identify volunteers for implementing/reviewing/testing.

Volunteeers wanted - please comment if you are willing to help on vspec2graphql!