Re-do directions to be friendly for cycling and driving

[ellenhp]

Valhalla + the web TTS api should make this tractable, but it should probably be split to its own issue eventually.

[ellenhp]

We might need to swap the map style to be friendlier for this. I'm in favor of removing all map label text for driving, personally. Every time someone nearly kills me on my motorcycle I get more and more cautious about how we implement this, and I have close calls nearly every day. I don't want blood on my hands because someone did a distracted driving. I think we should also only enable driving nav for platforms that allow you to acquire a wake lock.

In the future we could use quasar's mobile export functionality to publish apps that use native tools for wake locks, then we could also push it out on iOS.