PATCH: twain -> sane/gphoto split [2/3]

[Marcus Meissner]

Hi,

This is the split out sane driver.

Functionality was not changed, except that the autoprobing
is done differently now.

Please rerun dlls/make_dlls and autoconf.

Ciao, Marcus

Changelog:
	Split out the sane specific parts from twain_32 code.
	Autoprobing via DG_CONTROL/DAT_IDENTITY/MSG_GET.
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