WIPDNM wbeditentity allow changing claims

This isn't as simple as I would have hoped due to
ChangeOpStatement.

When using wbeditentity with this code and id=L1 for example the
ChangeOp gets applied to L1. Changes to statements will have guids such
as L1-F1$abc, which causes ChangeOpStatement::validateStatementGuid to
fail.

The ChangeOp needs a way to see all statements in an entity, and sub
entities?

Random thoughts:
StatementListProviderProvider?
SubEntityProvider?
Create a new ChangeOp specifically for Form Statements? / sub entity
statements?

Change-Id: I871075a9997f03ec10fe395f7bbe51429aa9912b