modules/checkers: introduce clear=,clear_color= settings

Similar to fill= and fill_color=, these influence how to treat
the "clear" cells.

Until now "clear" cells would unconditionally just be cleared via
til_fb_fragment_clear().  Now they can also be filled
w/color,sampled,textured, and maybe in the future a clear_module=
will also be introduced.

Note that for now I've left the clear_color randomizer disabled,
see code comments.

Having this setting also makes me wonder if the "filled" cells
should be optionally cleared using the "clear" setting first.
Imagine a scenario where you have fill_module=shapes, and you
want the color around the shape to match the clear color, for
instance...  Especially once you can pass a color down to the
fill_module, controlling these things becomes more critical.

There's definitely more work to do here.

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