UI infrastructure and simple "Help" dialog (#3)

Sets up some WIP infrastructure for building out the UI, and adds a simple popup
to show the navigation controls for the app.

studio-frontend/tsconfig.app.json

@@ -4,6 +4,12 @@
     "outDir": "../dist/out-tsc",
     "types": ["node"]
   },
-  "exclude": ["src/**/*.spec.ts", "src/**/*.test.ts"],
-  "include": ["src/**/*.ts"]
+  "exclude": [
+    "src/**/*.spec.ts",
+    "src/**/*.test.ts"
+  ],
+  "include": [
+    "src/**/*.ts",
+    "typings/*.d.ts"
+  ]
 }