Make the "recent games" section more modular.

Make the "recent games" section more modular.

The main page was constructing all of the recent games queries
manually before. Now I've moved the query and the associated
class (which would have been a namedtuple if not for the various
transformations needed) into a new "helpers" view. This view is
intended to house query functions and the corresponding classes
for them, so no more grabbing from a query, then looping around
and creating namedtuples to get stuff like nick_html_colors. Now
one can just pass the row returned by the query to a class, which
will "know" how to construct stuff like that. Win!