Add an SVG parser for the regions

The idea would be to use something like drawio as a graphical interface instead of YAML. Everything in all the region files would have to be represented there somehow, e.g.

• Each region is a box, each area in a box in that box, each point must be in an area's box and that's the main way we determine what spots are in what areas/regions.
• There has to be some field for properties or freeform text. Every shape has to be named.
• Spots are dots. Locations are different dots? Or canon locations are one dot, and all Locations are arrows pointing to the canon dot.
• Checks are all arrows
• Local movements are certain kinds of arrows.

If we can turn this data into the form used by the yaml, then it's a simple drop-in. But it may be better to integrate more cleanly with Compiler.py which transforms the yaml data further, and instead perform the appropriate transforms on the svg data.