core: keep track of all PIN retry counts

Added a PinRetryCounts property on org.freedesktop.ModemManager.Modem.
This is dictionary that records the number of PIN tries remaining
for each of the possible PIN code types for which the modem is
capable of reporting the count. Also, these counts are kept up
to date across ChangePin and EnablePin operations, not just when
an unlock is attempted.

src/mm-callback-info.c

@@ -47,6 +47,16 @@ invoke_mm_modem_string_fn (MMCallbackInfo *info)
               info->error, info->user_data);
 }
 
+static void
+invoke_mm_modem_array_fn (MMCallbackInfo *info)
+{
+    MMModemArrayFn callback = (MMModemArrayFn) info->callback;
+
+    callback (info->modem,
+              (GArray *) mm_callback_info_get_data (info, CALLBACK_INFO_RESULT),
+              info->error, info->user_data);
+}
+
 static void
 modem_destroyed_cb (gpointer data, GObject *destroyed)
 {
@@ -151,6 +161,16 @@ mm_callback_info_string_new (MMModem *modem,
     return mm_callback_info_new_full (modem, invoke_mm_modem_string_fn, (GCallback) callback, user_data);
 }
 
+MMCallbackInfo *
+mm_callback_info_array_new (MMModem *modem,
+                            MMModemArrayFn callback,
+                            gpointer user_data)
+{
+    g_return_val_if_fail (modem != NULL, NULL);
+
+    return mm_callback_info_new_full (modem, invoke_mm_modem_array_fn, (GCallback) callback, user_data);
+}
+
 gpointer
 mm_callback_info_get_result (MMCallbackInfo *info)
 {