DoPlayStopSelect into ProjectAudioManager; remove button push-down...

... which was redundant with what happens in the yield to idle events in
ProjectAudioManager::Stop.

This removes direct dependency of ProjectAudioManager on ControlToolBar.

And remove another #include we don't need

src/ProjectAudioManager.h

@@ -110,6 +110,9 @@ public:
 
    void StopIfPaused();
 
+   bool DoPlayStopSelect( bool click, bool shift );
+   void DoPlayStopSelect( );
+
    PlayMode GetLastPlayMode() const { return mLastPlayMode; }
 
 private:
@@ -163,10 +166,4 @@ AudioIOStartStreamOptions DefaultSpeedPlayOptions( AudacityProject &project );
 extern const ReservedCommandFlag
    CanStopAudioStreamFlag;
 
-/// Namespace for functions for Transport menu
-namespace TransportActions {
-bool DoPlayStopSelect( AudacityProject &project, bool click, bool shift );
-void DoPlayStopSelect( AudacityProject &project );
-}
-
 #endif