Add advanced configuration menu for notifications

plugins/notifications/menu.js

@@ -0,0 +1,13 @@
+const {urgencyLevels, setUrgency} = require("./utils");
+
+module.exports = (win, options) => [
+	{
+		label: "Notification Priority",
+		submenu: urgencyLevels.map(level => ({
+			label: level.name,
+			type: "radio",
+			checked: options.urgency === level.value,
+			click: () => setUrgency(options, level.value)
+		})),
+	},
+];