Pyezviz

-Use .get for missing service keys.

-Get service urls when logging in via token.
-Remove publish from mqtt, run with threading. (Your app should capture the on_message callback json messages)

-Added sound modes for 3 and 4

-Can now enable/disable camera status again. (Binary request to Ezviz CAS server, encrypted with AES and xored serial)
-Added MQTT function for push messages.
(Just create ezviz user with password ezviz on your mqtt broker)
-Refactored code.
*Moved exceptions to seperate file.
*Moved some of the duplicated constants to constants file.
-Updated requirements file.

-Fix for some cameras returning 0.0.0.0 ip.
-Also added android generic user agent for other OS types. (Windows IE gets different json formatted data as an example. Might be other cases as well)

-Added specific exception for invalid urls.