PATCH: twain -> sane/gphoto split [1/3]

[Marcus Meissner]

Hi,

This removes the datasource specific sources from twain_32, and adds
back autoprobing via a DG_CONTROL, DAT_IDENTITY, MSG_GET hidden feature.

Ciao, Marcus

Changelog:
	Removed the datasource specific parts (moved to sane.ds).
	Added management of loadable datasource drivers, can be
	wine builtin or native.
	Added autodetection management.
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