Whole-board viewer

[hinsley]

I'd like to work out a way to view large swaths of the game board at once. It's quite hard to figure out how to do this due to the stone coloring problem, but there may be compromises available. There are a few criteria I have for this feature:

1. The viewer should have smooth panning.
2. The viewer should allow zooming out substantially.
3. It should be possible to see what player each stone belongs to.
4. It should be possible to see the age of stones.
5. It should be possible to see the 13x13 locking windows about any stone by selecting that stone.
6. The user should be able to place new stones via the viewer.

I'll probably end up developing a <canvas> widget for the viewer with AJAX REST requests or similar. I'm not looking to pull in large frameworks.