use the new json/websocket features of Mojolicious 3.77
added sendViaWS callbacks for success and failure
fix page removal code to use common sendViaWS helper
json_message_content_is has been renamed json_message_is with a json path
added _send_text test helper which makes the tests send websocket data that matches watch my browsers send. Still there feels like something more is going on
found incongruity between test and actual implemenation (phfeeew)