core: added signalling for timecode display changes

Allows targeted application-wide UI updates for when the user changes the
timecode display so that the response is immediate.

app/common/timecodefunctions.cpp

@@ -258,13 +258,3 @@ int64_t Timecode::time_to_timestamp(const double &time, const rational &timebase
 {
   return qRound64(time * timebase.flipped().toDouble());
 }
-
-Timecode::Display Timecode::CurrentDisplay()
-{
-  return static_cast<Timecode::Display>(Config::Current()["TimecodeDisplay"].toInt());
-}
-
-void Timecode::SetCurrentDisplay(Timecode::Display d)
-{
-  Config::Current()["TimecodeDisplay"] = d;
-}

app/common/timecodefunctions.h

@@ -45,9 +45,6 @@ public:
     kMilliseconds
   };
 
-  static Display CurrentDisplay();
-  static void SetCurrentDisplay(Display d);
-
   /**
    * @brief Convert a timestamp (according to a rational timebase) to a user-friendly string representation
    */