Fix SVG/PNG export when waveforms contains Unicode strings. Based on: http://stackoverflow.com/questions/23223718/failed-to-execute-btoa-on-window-the-string-to-be-encoded-contains-characte
Fix SVG/PNG export when waveforms contains Unicode strings.
Based on:
http://stackoverflow.com/questions/23223718/failed-to-execute-btoa-on-window-the-string-to-be-encoded-contains-characte

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