Don't rely on order of Bind to EVT_TRACK_PANEL_TIMER from project...

... instead, re-process the event, and let each handler bind to the one it
depends on.

This still leaves a critical ordering of construction of playback scroller and
play indicator overlay in AudacityProject::AudacityProject (reverse of the
previous), but that will be removed by other means.

src/ViewInfo.cpp

@@ -204,4 +204,6 @@ void ViewInfo::OnTimer(wxCommandEvent &event)
 {
    mRecentStreamTime = gAudioIO->GetStreamTime();
    event.Skip();
+   // Propagate the message to other listeners bound to this
+   this->ProcessEvent( event );
 }