Improvements on registry editor skill

[gerard1001]

• list_entities new entity type: viewtemplates. show the list of available viewtemplates, each with a description (nothing else)
• list_entities new entity type: types. List the available type names in getState().types, each with only a description
• get_entity new entity type: type. Show for the given type: name, description, attributes, and fieldviews, each with description and config fields (some of this may not be possible if they are functions)
• get_entity should, where possible, in addition to returning the entity also return the json schema and/or some description of the fields and the possible values they can take.
• set_entity new entity type: module configuration. it should be possible to change values in the module's config
• set_entity new entity type: role set-entity should be able to create new roles

NEW:

• when running set_entity, do as much checking as possible and if an error is found don't apply the changes but return a string with the error (as much detail as possible but a full stack trace is probably not useful).