Changes to List signals

the data/items/reasons/items/importance response's property type changed from number to string, and format from double to no format for status 200

the data/items/score response's property type changed from number null to string null, and format from double to no format for status 200

the response property data became required for the status 200

deleted the header request parameter Authorization

the endpoint scheme security bearer_auth was added to the API

api operation id listSignals removed and replaced with signals_listSignals