Add 256x256 and 64x64 Beremiz icons


remove svg:midPointStop tags from icons.svg, because Inkscape
complained about unsupported tag. It seems that these tags were made
by Adobe Illustrator and aren't supported by any other app.

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<?xml version="1.0" encoding="UTF-8"?>

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<BeremizRoot>

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  <TargetType>

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    <Xenomai/>

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  </TargetType>

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</BeremizRoot>