TODO - Map quality

Geometry

generalized_trim_back
- breaks down when we have jagged lane endings due to polyline shift angle correction
- sometimes a lane polyline hits the perpendicular of a trimmed road! where was this happening?
handle small roads again somehow?
- what's correct for 14th and e boston? if we had less lanes there, would it help?
- make the polygons for the merged intersections look better
  - the thick road bands for tiny roads totally vanish... is that good?
- same for the sidewalk corners
- make sure the turns are reasonable
- apply the merge automatically somehow
- or retry the later-phase intersection merging
  - kind of need the ability to step through and see each stage...
  - composite turns have inner loops!
  - deal with all TODOs (like sidewalks)
- model U-turns
zorder for bridges/tunnels
- apply to cars/peds too; figure out statics/dynamics plumbing
degenerate-2's should only have one crosswalk
- then make them thinner
ped paths through sidewalk corners are totally broken
- calculate the better paths first, then make the corner geometry from that?
car turns often clip sidewalk corners now
figure out what to do about yellow center lines
- intersections on one-ways look weird
- yellow and white lines intersect cars and turn icons and such
- who should own drawing them?

if building front path intersects another building, then scrap that building.
- or wait, just require bldgs to be even closer to sidewalk first.
- need to do polygon vs polygon check!
- will need to speed it up with quadtree containing entire buildings. make sure these are easy to use.
can we make OSM buildings with holes?
- experiment with https://docs.rs/clipping/0.1.1/clipping/gh/struct.CPolygon.html and https://github.com/21re/rust-geo-booleanop