Restructure project directories (#333)

`/client/web` -> `/frontend`
`/client/cli` -> *delete for now*
`/client/native` -> *delete for now*
`/core/editor` -> `/editor`
`/core/document` -> `/graphene`
`/core/renderer` -> `/charcoal`
`/core/proc-macro` -> `/proc-macros` *(now plural)*

editor/src/global/global_message_handler.rs

@@ -0,0 +1,40 @@
+use crate::message_prelude::*;
+use std::collections::VecDeque;
+
+#[impl_message(Message, Global)]
+#[derive(PartialEq, Clone, Debug, Hash)]
+pub enum GlobalMessage {
+	LogInfo,
+	LogDebug,
+	LogTrace,
+}
+
+#[derive(Debug, Default)]
+pub struct GlobalMessageHandler {}
+
+impl GlobalMessageHandler {
+	pub fn new() -> Self {
+		Self::default()
+	}
+}
+
+impl MessageHandler<GlobalMessage, ()> for GlobalMessageHandler {
+	fn process_action(&mut self, message: GlobalMessage, _data: (), _responses: &mut VecDeque<Message>) {
+		use GlobalMessage::*;
+		match message {
+			LogInfo => {
+				log::set_max_level(log::LevelFilter::Info);
+				log::info!("set log verbosity to info");
+			}
+			LogDebug => {
+				log::set_max_level(log::LevelFilter::Debug);
+				log::info!("set log verbosity to debug");
+			}
+			LogTrace => {
+				log::set_max_level(log::LevelFilter::Trace);
+				log::info!("set log verbosity to trace");
+			}
+		}
+	}
+	advertise_actions!(GlobalMessageDiscriminant; LogInfo, LogDebug, LogTrace);
+}

editor/src/global/mod.rs

@@ -0,0 +1,3 @@
+pub mod global_message_handler;
+
+pub use global_message_handler::{GlobalMessage, GlobalMessageDiscriminant, GlobalMessageHandler};