feat(websocket)!: Implement WebSocket connection and event handling

knockoutwhistweb/app/controllers/MainMenuController.scala

@@ -54,9 +54,9 @@ class MainMenuController @Inject()(
         "errorMessage" -> "Invalid form submission"
       ))
     }
-    
+
   }
-  
+
   def joinGame(): Action[AnyContent] = authAction { implicit request: AuthenticatedRequest[AnyContent] =>
     val jsonBody = request.body.asJson
     val gameId: Option[String] = jsonBody.flatMap { jsValue =>
@@ -90,7 +90,7 @@ class MainMenuController @Inject()(
     Ok(views.html.main("Knockout Whist - Rules")(views.html.mainmenu.rules(Some(request.user))))
   }
 
-  def navSPA(location: String) : Action[AnyContent] = authAction { implicit request: AuthenticatedRequest[AnyContent] =>
+  def navSPA(location: String): Action[AnyContent] = authAction { implicit request: AuthenticatedRequest[AnyContent] =>
     location match {
       case "0" => // Main Menu
         Ok(Json.obj(