This should take care of most of the class property conversions to
use the new annotation format (colon instead of equals) for
assignment in 2.80. There may still be a few edge cases that
were missed.
Port requested for work on mango.blender.org
Notes:
- all lines import as a single object (could use curves/polylines instead)
- at the moment we are scaling by 1.5 on an axis, which seems odd, need to look into this.
- no face-filling happens at the moment could use BMesh ngons for this.
- theres probably more data that could be imported from these OSM/XML files.