Add the ability to add/remove a chat background (Closes #1)

module/settings/chatSidebarBackground.mjs

@@ -0,0 +1,35 @@
+import { __ID, inDev } from "../consts.mjs";
+
+const key = `chatSidebarBackground`;
+
+const config = {
+	name: `OFT.setting.${key}.name`,
+	hint: `OFT.setting.${key}.hint`,
+	scope: `user`,
+	type: Boolean,
+	default: true,
+	config: true,
+	requiresReload: false,
+	onChange: (newValue) => {
+		if (inDev()) {
+			console.log(`${__ID} | setting:${key} | Setting to: ${newValue}`);
+		};
+		document.body.classList.toggle(`oft-${key}`, newValue);
+	},
+};
+
+export const chatSidebarBackground = {
+	value() {
+		return game.settings.get(__ID, key);
+	},
+	register() {
+		game.settings.register(__ID, key, config);
+
+		if (this.value()) {
+			if (inDev()) {
+				console.log(`${__ID} | setting:${key} | Adding chat background`);
+			};
+			document.body.classList.add(`oft-${key}`);
+		};
+	},
+};