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

[Jeremy White]

(This version revised to eliminate casts as pointed out by Rob, and also to
eliminate the use of HeapAlloc as requested by Alexandre).

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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