Allow MaxLib.WebServer.WebSocket.EventFactory to handle unknown or broken events.

The current implementation ignores unregistered events and broken JSON code and produce always (!) log errors. Also the implementation of "TryParse" is not correct as such as it catches all exceptions (there are some cases where catching of all errors is not intended).

Start by locating MaxLib.WebServer.WebSocket.EventFactory and its TryParse implementation. Trace how unregistered events and malformed JSON are handled, then verify that expected unknown or broken events do not always produce error logs and that TryParse does not catch every exception.

Written by the indexing model from the issue text.