Add JSONAPI routes.

lib/classes/FeedbackRange.interface.php

lib/classes/JsonApi/RouteMap.php

lib/classes/JsonApi/Routes/Feedback/Authority.php

...lasses/JsonApi/Routes/Feedback/FeedbackElementsCreate.php

...lasses/JsonApi/Routes/Feedback/FeedbackElementsDelete.php

lib/classes/JsonApi/Routes/Feedback/FeedbackElementsShow.php

...lasses/JsonApi/Routes/Feedback/FeedbackElementsUpdate.php

...classes/JsonApi/Routes/Feedback/FeedbackEntriesCreate.php

...classes/JsonApi/Routes/Feedback/FeedbackEntriesDelete.php

lib/classes/JsonApi/Routes/Feedback/FeedbackEntriesShow.php

...classes/JsonApi/Routes/Feedback/FeedbackEntriesUpdate.php

lib/classes/JsonApi/Routes/Feedback/RangeTypeAware.php

lib/classes/JsonApi/Routes/Feedback/RatingHelper.php

lib/classes/JsonApi/Schemas/FeedbackElement.php