WebGL

I've been working on getting a WebGL onto the page.  It'll make it easier for folks to play it, which is always a good thing.

It seems to be working and I'm iterating it to make it cleaner.  Right now I believe it functionally works - there are some UI scaling issues which are more annoying than anything.

On the back end, I've changed how frost damage slows enemies.  This should make all speed adjustments better in the long run as well.

Looking ahead: I'll be working on adding a ton of maps and enemies soon.  Please let me know how it looks graphically and how the general gameplay loop is.

Thank you!