SWI-Prolog Mosquitto MQTT Pack

This pack uses mosquitto library in the foreign code to add MQTT functionality to SWI-Prolog.

Supported features:

• async and sync connections
• mosquitto connection is stored in the PL_blob > this offers multiple mqtt connections
• connect/pub/sub/disconnect predicates in prolog
• custom callback per connection supported (set in options when creating connection)
• multithreaded support: an additional engine will be created and attached to mosquito thread to perform callbacks