Add support for exporting to SVG

Nikolay Kochulinrequested to merge
nnkochulin/drawy:work/nnkochulin/svg-export into master

The code might be a bit... bad (I don't know how this codebase is supposed to be organized), but it works!

a screenshot of a Drawy window and a chromium window with a .svg, showing the same contents

TODO:

  • Write the actual color of items, instead of always writing #ffffff
  • Write background colors of items
  • Manually wrap text, since SVG doesn't do this for us
Edited by Nikolay Kochulin

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