Restructure the entire editor codebase to consistently match the message hierarchy

Closes #744

editor/src/messages/debug/debug_message_handler.rs

@@ -0,0 +1,52 @@
+use super::utility_types::MessageLoggingVerbosity;
+use crate::messages::prelude::*;
+
+use std::collections::VecDeque;
+
+#[derive(Debug, Default)]
+pub struct DebugMessageHandler {
+	pub message_logging_verbosity: MessageLoggingVerbosity,
+}
+
+impl MessageHandler<DebugMessage, ()> for DebugMessageHandler {
+	#[remain::check]
+	fn process_message(&mut self, message: DebugMessage, _data: (), responses: &mut VecDeque<Message>) {
+		match message {
+			DebugMessage::ToggleTraceLogs => {
+				if let log::LevelFilter::Debug = log::max_level() {
+					log::set_max_level(log::LevelFilter::Trace);
+				} else {
+					log::set_max_level(log::LevelFilter::Debug);
+				}
+
+				// Refresh the checkmark beside the menu entry for this
+				responses.push_back(MenuBarMessage::SendLayout.into());
+			}
+			DebugMessage::MessageOff => {
+				self.message_logging_verbosity = MessageLoggingVerbosity::Off;
+
+				// Refresh the checkmark beside the menu entry for this
+				responses.push_back(MenuBarMessage::SendLayout.into());
+			}
+			DebugMessage::MessageNames => {
+				self.message_logging_verbosity = MessageLoggingVerbosity::Names;
+
+				// Refresh the checkmark beside the menu entry for this
+				responses.push_back(MenuBarMessage::SendLayout.into());
+			}
+			DebugMessage::MessageContents => {
+				self.message_logging_verbosity = MessageLoggingVerbosity::Contents;
+
+				// Refresh the checkmark beside the menu entry for this
+				responses.push_back(MenuBarMessage::SendLayout.into());
+			}
+		}
+	}
+
+	advertise_actions!(DebugMessageDiscriminant;
+		ToggleTraceLogs,
+		MessageOff,
+		MessageNames,
+		MessageContents,
+	);
+}