Replace base64 files with library. Major refactoring.

include/wordclock_constants.h

@@ -67,4 +67,12 @@
 #define MATRIX_WIDTH (11)
 #define MATRIX_HEIGHT (11)
 
+// NTP macros
+#define BUILD_YEAR (__DATE__ + 7)                  /* Will expand to current year at compile time as string. */
+#define NTP_MININUM_RX_YEAR (atoi(BUILD_YEAR) - 1) /* Will expand to current year at compile time minus one. */
+#define NTP_MININUM_YEAR (1900)                    // NTP minimum year is 1900
+#define NTP_MAX_UPDATE_TIME_US (500000)    // 500ms max update time
+#define NTP_NEXT_UPDATE_DELAY_US (10000000)        // 10s delay time between updates
+#define NTP_WATCHDOG_COUNTER_INIT (30)             // Watchdog value, count of retries before restart
+
 #endif /* WORDCLOCK_CONSTANTS_H */