Scribe: Prep game state for detection of glyphs

There's not any detection of glyphs here yet, there's simply a new
slot in each of the squares: Where we used to just have a textual
ymbol for each occupied square, we now have an object:

	{
          symbol: '+' or 'o',
          glyph: true or false
        }

And the glyph Boolean is used to add a class to the HTML square
element as well.