Remove ClaimList, ClaimGroup, ClaimGroupSet?

[lucaswerkmeister]

I don’t know their history, but as far as I can tell, ClaimList, ClaimGroup and ClaimGroupSet are currently unused, except that Wikibase Serialization JavaScript knows how to (de)serialize them. Perhaps they can be removed?

Bug: T172916

[thiemowmde]

Fixed via:

• Remove unused Claim collection (de)serializers WikibaseSerializationJavaScript#46
• Remove unused Claim collections #80