beremiz

WIP: Add skeleton for MQTT extension based on part of OPC-UA extension.

For now generated code makes no sense but persistently-configurable-C-generating-extension infrastructure is there.
Run PLC code, trace and force variables
=======================================
Build
-----
Transfer
--------
IDE and runtime must be connected (see :doc:`connect`)
..
TODO
Run
---
..
TODO
Trace and Force variables
-------------------------
..
TODO
Instance panel
^^^^^^^^^^^^^^
..
TODO
Debug view
^^^^^^^^^^
..
TODO
Debug plots
^^^^^^^^^^^
..
TODO