[all] BEEPER renamed to BUZZER, PHASES renamed to MODES

[Taranis] PPM Center Adjustable
[stock] Issue 225 fixed
[all] Throttle Inverted is now a Model parameter
[Taranis] Issue 15 fixed (when >5 GVARS)
[Gruvin9x] Issue 16 almost fixed

src/menus.h

@@ -133,6 +133,12 @@ void menuStatisticsDebug(uint8_t event);
   #define p1valdiff 0
 #endif
 
+#if defined(NAVIGATION_POT2)
+  extern int8_t p2valdiff;
+#else
+  #define p2valdiff 0
+#endif
+
 extern int8_t checkIncDec_Ret;  // global helper vars
 
 #define EDIT_SELECT_MENU   -1