Massive code clean up: (Fixes Issue 161)

- Remove typedef from internal structs
- Remove _t suffix from types
- Fix tests using connstrings

examples/pn53x-diagnose.c

@@ -54,7 +54,7 @@ main (int argc, const char *argv[])
 {
   size_t  szFound;
   size_t  i;
-  nfc_device_t *pnd;
+  nfc_device *pnd;
   const char *acLibnfcVersion;
   bool    result;