The directors shall have the management and superintendence of the affairs of the company, and they may lawfully exercise all the powers of the company, except as to such matters as are directed by this or the special Act, to be transacted by a general meeting of the company; but all the powers so to be exercised shall be exercised in accordance with and subject to the provisions of this and the special Act; and the exercise of all such powers shall be subject also to the control and regulation of any general meeting specially convened for the purpose, but not so as to render invalid any act done by the directors prior to any resolution passed by such general meeting.