Vector maps

[siiruli]

Maps are slow and have low quality when zooming. It's not easy to show stops and lines on the map like in the HSL app.

Use vector maps instead of the current tile map.

[ollpu]

There is the vector_map_tiles package, but it is also quite slow and doesn't support geojson or special layers like symbols, circles and lines. We could look into mapbox_gl instead.

The style generation script https://github.com/HSLdevcom/hsl-map-style only works with Javascript. Is it enough to pregenerate it? Can the individual layers be toggled separately?