Add function gpgme_data_identify.
* src/gpgme.h.in (gpgme_data_type_t): New. (gpgme_data_identify): New prototype. * src/data-identify.c: New. * src/parsetlv.c, src/parsetlv.h: New. Take from gpa. * src/libgpgme.vers, src/gpgme.def: Add gpgme_data_identify. * src/gpgme-tool.c (status): Add STATUS_IDENTIFY_RESULT. (gt_identify): New. (cmd_identify): New. (hlp_passwd): Move close to cmd_passwd.
It is often useful to have a way to identify the data which needs
processing. This is such a common task that it makes sense to
implement this in gpgme to avoid diverging implementations.