Add struct field visualization to the editor message hierarchy tree visualization on the website (#2917)

* Fix Message Tree: Enforce Structure and Visibility

* Code review

* fix the erroreous ouputs

* error handling for MessageHandler

* Fix website visualization HTML generation

* error handling for tuple-style message enum variant

* cleanup

* Update messages

* Normalize BroadcastEvent

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

editor/src/messages/broadcast/broadcast_message_handler.rs

@@ -2,7 +2,8 @@ use crate::messages::prelude::*;
 
 #[derive(Debug, Clone, Default, ExtractField)]
 pub struct BroadcastMessageHandler {
-	listeners: HashMap<BroadcastEvent, Vec<Message>>,
+	event: EventMessageHandler,
+	listeners: HashMap<EventMessage, Vec<Message>>,
 }
 
 #[message_handler_data]
@@ -10,19 +11,15 @@ impl MessageHandler<BroadcastMessage, ()> for BroadcastMessageHandler {
 	fn process_message(&mut self, message: BroadcastMessage, responses: &mut VecDeque<Message>, _: ()) {
 		match message {
 			// Sub-messages
-			BroadcastMessage::TriggerEvent(event) => {
-				for message in self.listeners.entry(event).or_default() {
-					responses.add_front(message.clone())
-				}
-			}
+			BroadcastMessage::TriggerEvent(message) => self.event.process_message(message, responses, EventMessageContext { listeners: &mut self.listeners }),
 
 			// Messages
 			BroadcastMessage::SubscribeEvent { on, send } => self.listeners.entry(on).or_default().push(*send),
-			BroadcastMessage::UnsubscribeEvent { on, message } => self.listeners.entry(on).or_default().retain(|msg| *msg != *message),
+			BroadcastMessage::UnsubscribeEvent { on, send } => self.listeners.entry(on).or_default().retain(|msg| *msg != *send),
 		}
 	}
 
 	fn actions(&self) -> ActionList {
-		actions!(BroadcastEventDiscriminant;)
+		actions!(EventMessageDiscriminant;)
 	}
 }