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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#!/bin/bash

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INKSCAPE=inkscape

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for i in `cat icons.svg |grep -o -e '%%[^%]*%%'|sed 's/%//g'` 

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do

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 if [ $i.png -nt icons.svg ]; then

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 	echo "Skip $i"

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 else

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	rm  -f $i.png

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	echo "$INKSCAPE" icons.svg -z -e $i.png -i $i

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	"$INKSCAPE" icons.svg -z -e $i.png -i $i

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 fi

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done

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