fix(webkit): Do not show error window on protocol errors

* A lot of commands are not supported by NativeScript. We'd better
keep the previous behaviour of simply reporting without stopping
on such errors.

* Revive the commented `activateDomain` calls. Since they are no
longer shown in the UI its better to keep them, so that the frontend
starts working if they become implemented in the future.

* Match {N} CLI's debugger proxy port. This way it will be possible
to use Safari for debugging the frontend without relying on the
proxy in `src/debugging` of iOS Runtime's repository.

Author: mbektchiev

src/debugging/debugger-proxy.js

@@ -32,7 +32,7 @@ PacketStream.prototype._transform = function(packet, encoding, done) {
 };
 
 var server = new ws.Server({
-    port: 8080
+    port: 41000
 });
 server.on("connection", function(webSocket) {
     console.info("Frontend client connected.");