modules/checkers: add sampled overlay option

When used as an overlay, source the checker color from the
existing contents under the checker.  This basically becomes a
pixelating effect, but with a checkered layout.  If a dynamics
setting for odd+even (filled) were added, in combination with
sampled=on it would become plain pixelation.

This commit uses a single sample, but more could be used to be
more of an average than a potentially flickering checker
depending on what's going on underneath.  Probably another option
like samples=N when sampled=on.

If using this option, one probably isn't interested in texturing,
which illustrates a need for the fb_fragment_put/fill API to have
a texturing allowed toggle.  Then on a per-call basis the
texturing could be toggled which enables some very interesting
possibilities.

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