Some useful debugging / correctness steps towards more robust blockfi…

…nding. [rebuild] [release]

I have another branch that handles roads without sidewalks on one side
-- it helps in some cases, but regresses in others, so not merging it
yet. But taking a smaller step and bringing in some stricter common
endpoint logic from there.

Bringing in some useful intermediate changes

new release

Shrink the Bradford study area, to load faster on the web. [rebuild] …

…[release]

Download new Leeds OSM data, with a geometry fix that gets us a littl…

…e closer to creating a block for LTNs everywhere. [rebuild] [release]

Fix clippy warnings. [rebuild] [release]

Model diagonal LTN filters. a-b-street#794 [rebuild] [release]

Only supported at 4-way intersections currently.

Start GH sponsors

Round of clippy (and reverting a temporary bit that broke challenge m…

…odes) [rebuild] [release]

Render A/B Street's lanes and traffic simulation on top of Mapbox GL (a…

…-b-street#788)

[rebuild] [release]

Pin georust overrides to the main git repos, not branches. [rebuild] …

…[release]

The mkirk/concave-hull-fix-empty-crash branch was deleted recently,
causing CI failures. We can just pin to a recent commit on the main
branch.