SVG Export: support for real-world units

[tudor]

Since the SVG format seems to be popular in the cutting/engraving/3D-printing industry, it would be great if Vectorstyler provided support for setting SVG dimensions in real-world units like millimeters or inches.

For example, in CorelDraw the SVG export panel has options for choosing the units of measurement (and also the dimensions of the exported file; this might be useful too, in case someone wants to scale the exported file for some reason):

[VectorStyler]

@tudor I added this to the backlog.