Add a fullscreen button and the keyboard lock API (#266)

Closes #249

client/web/src/main.ts

@@ -1,9 +1,11 @@
 import { createApp } from "vue";
+import { fullscreenModeChanged } from "@/utilities/fullscreen";
 import { handleKeyUp, handleKeyDown } from "@/utilities/input";
 import App from "./App.vue";
 
 // Bind global browser events
 document.addEventListener("contextmenu", (e) => e.preventDefault());
+document.addEventListener("fullscreenchange", () => fullscreenModeChanged());
 window.addEventListener("keyup", (e: KeyboardEvent) => handleKeyUp(e));
 window.addEventListener("keydown", (e: KeyboardEvent) => handleKeyDown(e));