Group all of the hotbar settings into a submenu (closes #15)

module/apps/HotbarSettingsMenu.mjs

@@ -0,0 +1,21 @@
+import { categories } from "../utils/SubMenuSettings.mjs";
+import { OFTSettingsMenu } from "./OFTSettingsMenu.mjs";
+
+export class HotbarSettingsMenu extends OFTSettingsMenu {
+	static DEFAULT_OPTIONS = {
+		window: {
+			title: `OFT.menu.hotbarSettings.name`,
+		},
+	};
+
+	static get _SETTINGS() {
+		const settings = categories.get(`hotbar`);
+		const settingIDs = [];
+		for (const [settingID, shown] of settings.entries()) {
+			if (shown) {
+				settingIDs.push(settingID);
+			};
+		};
+		return settingIDs;
+	};
+};