Add OPC-UA simple synchronous client extension.

This extension uses python-opcua to growse server nodes, and generates runtime C code that use open62541.
- python-opcua must be available in python path (i.e. "import opcua" must succeed). Can be installed from pypi with "python2 -m pip install opcua --user" .
- at build time, open62541 is expected to be build in "open62541" directory, aside "beremiz" directory.

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Beremiz's user manual

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Contents:

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.. toctree::

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   :maxdepth: 2

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   install

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   start

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   edit

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   build

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   connectors

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   debug