Add device listing capabilities

- acr122: add acr122_pick_device(), acr122_list_devices();
  - Add device name to device descriptions (nfc_device_desc_t) to select a given PCSC device;
  - Use constants for driver names;
  - Various code cleanups and enhancements.

src/examples/nfc-list.c

@@ -121,5 +121,5 @@ int main(int argc, const char* argv[])
   }
 
   nfc_disconnect(pnd);
-  return 1;
+  return 0;
 }