Introduce an early reporting mechanism for verify and match

It is a good idea to report match results early, to e.g. log in a user
immediately even if more device interaction is needed. Add new _full
variants for the verify/identify functions, with a corresponding
callback. Also move driver result reporting into new
fpi_device_{identify,verify}_report functions and remove the reporting
from the fpi_device_{identify,verify}_complete calls.

Basic updates to code is done in places. Only the upekts driver is
actually modified from a behaviour point of view. The image driver code
should be restructured quite a bit to split the reporting and only
report completion after device deactivation. This should simplifiy the
code quite a bit again.

libfprint/fp-device-private.h

@@ -63,3 +63,20 @@ typedef struct
 } FpEnrollData;
 
 void enroll_data_free (FpEnrollData *enroll_data);
+
+typedef struct
+{
+  FpPrint       *enrolled_print;   /* verify */
+  GPtrArray     *gallery;   /* identify */
+
+  gboolean       result_reported;
+  FpPrint       *match;
+  FpPrint       *print;
+  GError        *error;
+
+  FpMatchCb      match_cb;
+  gpointer       match_data;
+  GDestroyNotify match_destroy;
+} FpMatchData;
+
+void match_data_free (FpMatchData *match_data);