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/tool/tools/path.rs

@@ -0,0 +1,18 @@
+use crate::message_prelude::*;
+use crate::tool::ToolActionHandlerData;
+
+#[derive(Default)]
+pub struct Path;
+
+#[impl_message(Message, ToolMessage, Path)]
+#[derive(PartialEq, Clone, Debug, Hash)]
+pub enum PathMessage {
+	MouseMove,
+}
+
+impl<'a> MessageHandler<ToolMessage, ToolActionHandlerData<'a>> for Path {
+	fn process_action(&mut self, action: ToolMessage, data: ToolActionHandlerData<'a>, responses: &mut VecDeque<Message>) {
+		todo!("{}::handle_input {:?} {:?} {:?} ", module_path!(), action, data, responses);
+	}
+	advertise_actions!();
+}