New feature display pages added (issue #278)

include/button.h

@@ -1,6 +1,7 @@
 #ifndef _BUTTON_H
 #define _BUTTON_H
 
+#include "display.h"
 #include "senddata.h"
 
 void readButton();

include/display.h

@@ -4,12 +4,14 @@
 #include <U8x8lib.h>
 #include "cyclic.h"
 
-extern uint8_t DisplayState;
+extern uint8_t DisplayIsOn;
 
 extern HAS_DISPLAY u8x8;
 
 void init_display(const char *Productname, const char *Version);
 void refreshtheDisplay(void);
+void refreshtheDisplay(bool nextPage);
+void draw_page(time_t t, uint8_t page);
 void DisplayKey(const uint8_t *key, uint8_t len, bool lsb);
 
 #endif