Add support for MQTT-PAHO 2.0 versioned callbacks

[KIKI007]

Problem:

In the file mqtt_paho.py
when creating a client

self.client = mqtt.Client()

the new mqtt 2.0 version will give a error.

Fix:

from paho.mqtt.enums import CallbackAPIVersion
self.client = mqtt.Client(callback_api_version = CallbackAPIVersion.VERSION1)

[gonzalocasas]

Thanks for identifying this! For the time being, I'm going to release a new version that limits the mqtt paho version to be lower than 2.0, so that we first fix existing installs with minimum breaking changes. Afterwards, I will prepare a PR that adds your fix, or ideally try to update to callback version 2.0 directly!

[gonzalocasas]

Addressed this temporarily in v0.3.5: https:/compas-dev/compas_eve/releases/tag/v0.3.5