Repo cleanup and auto-follow polishing

Cleaned some files out of the repo that shouldn't have been there, and added .gitignore files to keep them from going in or being noticed.

Also made a few changes for the auto-follow code, but left it disabled for now so that it doesn't pull us away from the actual map (since real devices aren't actually in the Barre Town Forest, and will get good locks regularly where we are.)  Code to turn on and off the auto-follow should be added before re-enabling the code that is there.