Start dealing with thread related object lifetime issues

There are  several object  lifetime issues that  can cause  crashes on
application close down.  This change  is the first phase of addressing
these issues.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@5719 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

Modulator.cpp

@@ -4,6 +4,7 @@
 #include <QDateTime>
 #include <QDebug>
 #include "mainwindow.h"
+#include "soundout.h"
 
 #include "moc_Modulator.cpp"
 
@@ -27,7 +28,6 @@ unsigned const Modulator::m_nspd = 2048 + 512; // 22.5 WPM
 Modulator::Modulator (unsigned frameRate, unsigned periodLengthInSeconds,
                       QObject * parent)
   : AudioDevice {parent}
-  , m_stream {nullptr}
   , m_quickClose {false}
   , m_phi {0.0}
   , m_toneSpacing {0.0}