SVGHMI: added a watchdog. To ensure that the whole chain is checked, watchdog use a periodic echo of a hearteat variable. JS client code systematically register /HEARTBEAT at 1s update freq, and reacts on updates of /HEARTBEAT by systematically incrementing it. C code catch /HEARTBEAT update and feeds python-implemented watchdog. For now, watchdog does nothing when tiggered

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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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