Refresh walkthrough data, especially building outlines

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The OSM community frequently has discussions about how to teach new users to map better. This often takes the form of "new users are not drawing nice building outlines" and iD is usually made into a scapegoat.

I am a strong believer that "showing" someone what to do is better than "telling" them what to do. iD's walkthrough is amazing - it can take a user who has never edited a map before and have them making meaningful contributions to OSM in under 10 minutes.

The walkthrough data in Three Rivers, MI strikes a pretty good balance of showing the user a "complete" map without drifting too far into "micromapping". We want to show new users what is possible, what is expected of them, yet not overwhelm them.

One thing we can improve in the walkthrough is to show new users more building outlines. The walkthrough data has some building outline coverage, but most of the city does not have them. We should refresh the outlines from live OSM data so that new users see how building outlines should look when traced properly.

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I'm noticing a bunch of things that should be refreshed, to bring the walkthrough up to current OSM best practices. Just going to note them here:

• Full street names - no St, Ave, Rd abbreviations
• Add some building outlines
• Add some more POIs
• Paths crossing roads need a junction node
• Add some sidewalks/crosswalks
• Traffic signals
• Oneways in parking lots
• More complete addresses