[TWAIN] (take 3) Reconcile sane's long names to TWAIN's 32 byte limit

[Jeremy White]

(Remove the unused TWAIN_strdup function).

libsane can return arbitrarily long names, but TWAIN supports only a maximum of 32.
Further, the name is a unique identifier, and so must be returned to libsane for processing.

This algorithm tries to convert a long libsane name into a more reasonable short name,
but adds a crude signature process in an attempt to ensure a unique short identifier.
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