Rework TimeManager & NTP handling. Remove module ESP8266TimerInterrupt.

include/wordclock_esp8266.h

@@ -82,7 +82,7 @@ void send_heartbeat(void);
 void set_dynamic_brightness(bool state);
 void set_main_color(uint8_t red, uint8_t green, uint8_t blue);
 void set_night_mode(bool on);
-void state_change(uint8_t newState);
+void state_change(ClockState_en new_state);
 void update_matrix(void);
 void write_settings_to_EEPROM(void);