modules/blinds: add count and orientation settings

This adds count=N and orientation={horizontal,vertical} settings.

Which was precipitated by the introduction of a vertical blinds
mode.

e.g.:

--module=blinds,count=32,orientation=vertical

or for a quick tour of the possibilities:

--module=rtv,channels=blinds,duration=1,context_duration=1,snow_duration=0

weeeee

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