respondToGroupInvite(groupSteamID, accept) {
		let buffer = ByteBuffer.allocate(9, ByteBuffer.LITTLE_ENDIAN);
		buffer.writeUint64(Helpers.steamID(groupSteamID).toString());
		buffer.writeUint8(accept ? 1 : 0);

		this._send(EMsg.ClientAcknowledgeClanInvite, buffer.flip());
	}
Respond to an incoming group invite.
@param {(SteamID|string)} groupSteamID - The group you were invited to, as a SteamID object or a string which can parse into one
@param {boolean} accept - true to join the group, false to ignore invitation