totp : rework and add SHA256/512 (#151)

* totp : rework and add SHA256/512

* totp : comment code

* totp : fix SHA224/SHA384 and examples

* totp : fix bug in totp_face_lfs

* totp : init_totp_record to SHA1

* totp : move TOTP-MCU to TOTP, update README and example

* totp : SHAX, use size_t n instead of harcoded 8

* clarify what to put in TOTP face

Co-authored-by: Emilien <Emilien>
Co-authored-by: joeycastillo <joeycastillo@utexas.edu>

movement/lib/TOTP/example.c

@@ -0,0 +1,27 @@
+#include "TOTP.h"
+#include <stdio.h>
+
+/**
+ * example.c
+ */
+void main(void)
+{
+	uint8_t hmacKey[] = {0x4d, 0x79, 0x4c, 0x65, 0x67, 0x6f, 0x44, 0x6f, 0x6f, 0x72};               // Secret key
+	TOTP(hmacKey, 10, 7200, SHA1);                                                                        // Secret key, Key length, Timestep (7200s - 2hours)
+
+	setTimezone(9);                                                                                 // Set timezone
+	uint32_t newCode = getCodeFromTimestamp(1557414000);                                            // Timestamp Now
+
+	///////////////// For struct tm //////////////////
+    //	struct tm datetime;
+    //	datetime.tm_hour = 9;
+    //	datetime.tm_min = 0;
+    //	datetime.tm_sec = 0;
+    //	datetime.tm_mday = 13;
+    //	datetime.tm_mon = 5;
+    //	datetime.tm_year = 2019;
+	//  uint32_t newCode = getCodeFromTimeStruct(datetime);
+	///////////////////////////////////////////////////
+
+	printf("Code : %06u\n",newCode);
+}