The enumeration of particular powers by this Charter shall not be held or deemed to be exclusive, but, in addition to the powers enumerated therein or implied thereby, or appropriate to the exercise of such powers, it is intended that the City shall have, and may exercise, all powers of local self-government, and all powers enumerated in Chapter 13, Title 28, Article 1175 of the Revised Civil Statutes of the State of Texas of 1925, and any amendments thereof, or any other powers which, under the Constitution and laws of the State of Texas, it would be competent for this Charter specifically to enumerate. All powers of the City, whether expressed or implied, shall be exercised in the manner prescribed herein, or when not prescribed herein, then in the manner provided by the general laws of Texas relating to cities and towns. The City shall have the power to cooperate with the Federal Government and its agencies and with the State Government and its agencies, and with any political subdivision, or agency thereof.