Bring back the TableMapView, and build an editor around it.

[stephank]

The initial commit had drawing code that built a large DOM table and used page scrolling for the map. This worked, but wasn't as smooth in a lot of browsers as canvas rendering. The code was removed in commit dedffaa.

This code should be brought back in a TableMapView class. I'd like to see it used in a new map editor web application. I don't mind if the first iteration of the editor doesn't really edit at all, but just allows you to explore a map with a TableMapView.