modules/blinds: make blinds threaded

This is a first stab at threading blinds, while here I got rid of
the reliance on _checked() put_pixel for clipping.

This could be better, things like using a block put/copy instead
of put_pixel would be a huge advantage for blinds due to its
naturally contiguous blocks per-blind.

While this module when non-threaded wasn't especially slow, any
module leaving cores idle is depriving other potentially threaded
modules of utilizing them for the duration of the non-threaded
render.  So now that rototiller is being used for compositions
and increasingly becoming something of a meta-demo, it's become
important to make everything as threaded as possible.

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