Developer options: added map tile option (low res, high res, no tiles)

- d8e1faa can be ignored (that commit is from https://github.com/mozilla/MozStumbler/pull/998), that is part of a merge, as I based the later changes off the changes in that commit.
- Also, cleaned up this code, moved crash reporting out of kml options
- No more toast, on low/high resolution switch, show a message on the map instead