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)*

frontend/wasm/src/lib.rs

@@ -0,0 +1,37 @@
+pub mod document;
+mod shims;
+pub mod utils;
+pub mod window;
+pub mod wrappers;
+
+use editor::{message_prelude::*, Editor};
+use std::cell::RefCell;
+use utils::WasmLog;
+use wasm_bindgen::prelude::*;
+
+// the thread_local macro provides a way to initialize static variables with non-constant functions
+thread_local! { pub static EDITOR_STATE: RefCell<Editor> = RefCell::new(Editor::new(Box::new(handle_response))) }
+static LOGGER: WasmLog = WasmLog;
+
+#[wasm_bindgen(start)]
+pub fn init() {
+	utils::set_panic_hook();
+	log::set_logger(&LOGGER).expect("Failed to set logger");
+	log::set_max_level(log::LevelFilter::Debug);
+}
+
+#[wasm_bindgen(module = "/../src/utilities/response-handler-binding.ts")]
+extern "C" {
+	#[wasm_bindgen(catch)]
+	fn handleResponse(responseType: String, responseData: JsValue) -> Result<(), JsValue>;
+}
+
+fn handle_response(response: FrontendMessage) {
+	let response_type = response.to_discriminant().local_name();
+	send_response(response_type, response);
+}
+
+fn send_response(response_type: String, response_data: FrontendMessage) {
+	let response_data = JsValue::from_serde(&response_data).expect("Failed to serialize response");
+	let _ = handleResponse(response_type, response_data).map_err(|error| log::error!("javascript threw an error: {:?}", error));
+}