Add Toronto Star imagery

[danvk]

We have permission to do this from the Toronto Public Library. This adds ~8,000 new images to the map, bringing us from ~35,000 → ~43,000.

There are a few remaining issues before we can launch these:

• Slightly shifted dots between TPL & CTA images that aren't merged, e.g. Yonge St & Adelaide St. E/W. This might just be an issue around cache reuse.
• Some bad POI names get surfaced, e.g. "post office" and "variety store".
• Toronto Star image titles are much longer than our previous ones, so we may want to clip them in previews.
• Switch to git-lfs for images.geojson (which is now >100MB).