modules/blinds: add taps for T,step,count

Part of me wants to give the blinds arbitrary angle instead of
the vert/horiz options.  But part of the beauty of blinds is the
jaggy-free aliasing-free sharp edges by virtue of always being
orthonormal using whole pixels.

Maybe in the future there could be a orientation setting where
you pick horiz/vert/angular.  Then only when angular does it get
a theta tap and use angled blinds with anti-aliased imperfect
edges...

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