sendNotification = function (notification, payload, sender, sendTo) {
		for (const m in modules) {
			const module = modules[m];
			if (module !== sender && (!sendTo || module === sendTo)) {
				module.notificationReceived(notification, payload, sender);
			}
		}
	}
Send a notification to all modules.
@param {string} notification The identifier of the notification.
@param {*} payload The payload of the notification.
@param {Module} sender The module that sent the notification.
@param {Module} [sendTo] The (optional) module to send the notification to.