Prefix defines.h, messages.h and types.h headers by "nfc-"

Rename dev_info struct to nfc_device_t
Some code cleanup
Rename pn531.h/c to pn531_usb.h/c
Rename pn533.h/c to pn533_usb.h/c

src/lib/drivers/pn533_usb.h

@@ -0,0 +1,38 @@
+/**
+ * Public platform independent Near Field Communication (NFC) library
+ * 
+ * Copyright (C) 2009, Roel Verdult
+ * 
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ * 
+ * 
+ * @file pn533.h
+ * @brief
+ */
+
+#ifndef _LIBNFC_DEV_PN533_H_
+#define _LIBNFC_DEV_PN533_H_
+
+#include "nfc-defines.h"
+#include "nfc-types.h"
+
+// Functions used by developer to handle connection to this device
+nfc_device_t* pn533_connect(const nfc_device_desc_t* pndd);
+void pn533_disconnect(nfc_device_t* pnd);
+
+// Callback function used by libnfc to transmit commands to the PN53X chip
+bool pn533_transceive(const dev_spec ds, const byte_t* pbtTx, const size_t szTxLen, byte_t* pbtRx, size_t* pszRxLen);
+
+#endif // _LIBNFC_DEV_PN533_H_
+