Be able to convert a drawing from one format to another in command line

Registered by arno_b

See: https://sourceforge.net/tracker2/?func=detail&atid=800129&aid=2297169&group_id=156523

For example, latexdraw --export-latex --file toto.svg --output toto.tex
In fact, we should be able to convert a source drawing in a given format to another drawing to another format, like that:
latexdraw -c toto.tex toto.svg
latexdraw -c toto.svg toto.eps
latexdraw --convert toto.svg toto.png

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