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/window.rs

@@ -0,0 +1,43 @@
+use wasm_bindgen::prelude::*;
+
+type DocumentId = u32;
+
+/// Modify the active Document in the editor state store
+#[wasm_bindgen]
+pub fn set_active_document(document_id: DocumentId) {
+	todo!("set_active_document {}", document_id)
+}
+
+/// Query the name of a specific document
+#[wasm_bindgen]
+pub fn get_document_name(document_id: DocumentId) -> String {
+	todo!("get_document_name {}", document_id)
+}
+
+/// Query the id of the most recently interacted with document
+#[wasm_bindgen]
+pub fn get_active_document() -> DocumentId {
+	todo!("get_active_document")
+}
+
+type PanelId = u32;
+/// Notify the editor that the mouse hovers above a panel
+#[wasm_bindgen]
+pub fn panel_hover_enter(panel_id: PanelId) {
+	todo!("panel_hover_enter {}", panel_id)
+}
+
+/// Query a list of currently available operations
+#[wasm_bindgen]
+pub fn get_available_operations() -> Vec<JsValue> {
+	todo!("get_available_operations")
+	// vec!["example1", "example2"].into_iter().map(JsValue::from).collect()
+}
+
+/*
+/// Load a new .gdd file into the editor
+/// Returns a unique document identifier
+#[wasm_bindgen]
+pub fn load_document(raw_data: &[u8]) -> DocumentId {
+	todo!()
+}*/