Mark repeated states with a leading asterisk

Signal the difference between new states and repeated states with an
asterisk for repeated states in the serial output.

Author: LeeLeahy2

Firmware/RTK_Surveyor/States.ino

@@ -1376,6 +1376,8 @@ void requestChangeState(SystemState requestedState)
 //Change states and print the new state
 void changeState(SystemState newState)
 {
+  if (newState == systemState)
+    Serial.print(F("*"));
   systemState = newState;
 
   //Debug print