approve all closed issues

[VladimirAlexiev]

This query finds closed issues that are not yet approved:
https://github.com/Sveino/Inst4CIM-KG/issues?q=is%3Aissue+is%3Aclosed+-label%3Aapproved

This more specific query adds the condition assignee=sveino, i.e. issues that I've closed and seek explicit approval/agreement by @Sveino or @griddigit-ci:
https://github.com/Sveino/Inst4CIM-KG/issues?q=is%3Aissue+is%3Aclosed+-label%3Aapproved+assignee%3Asveino
Periodically go through them and:

• add label approved if you agree
• maybe add label spec, if changes to specs are needed
• or reopen, comment, and assign to me for reverting and finding some workaround

The most important is #68: I rewrite cim: eu: to the new namespaces (#68 (comment)) but that will require similar changes to SHACL and instance data.