modules/checkers: center unaligned checkers scenarios

This introduces a bespoke fragmenter for checkers.  The generic
til_fb tiler isn't concerned with aesthetics so it doesn't
particularly care if clipped tiles are asymmetrically
distributed.  It worked fine to get checkers developed and
working, but it's really unattractive to have the whole be
off-centered when the checkers don't perfectly align with the
frame size.

There's some gross aspects like leaving the frame_{width,height}
to be corrected at render time so render_fragment can access the
incoming frame_width for cell state determination.

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