Dump stack trace on crash (Implement #849) (#870)

* Print stack trace on crash

* Printing stack trace is fully functional except for WIN32

* Minor fixes

* Minor fixes

libsrc/grabber/dispmanx/DispmanxWrapper.cpp

@@ -4,7 +4,7 @@ DispmanxWrapper::DispmanxWrapper(const unsigned grabWidth, const unsigned grabHe
 	: GrabberWrapper("Dispmanx", &_grabber, grabWidth, grabHeight, updateRate_Hz)
 	, _grabber(grabWidth, grabHeight)
 {
-	
+
 }
 
 void DispmanxWrapper::action()

libsrc/grabber/v4l2/V4L2Wrapper.cpp

@@ -33,6 +33,11 @@ V4L2Wrapper::V4L2Wrapper(const QString &device,
 	connect(&_grabber, SIGNAL(readError(const char*)), this, SLOT(readError(const char*)), Qt::DirectConnection);
 }
 
+V4L2Wrapper::~V4L2Wrapper()
+{
+	stop();
+}
+
 bool V4L2Wrapper::start()
 {
 	return ( _grabber.start() && GrabberWrapper::start());

libsrc/grabber/x11/X11Wrapper.cpp

@@ -6,6 +6,14 @@ X11Wrapper::X11Wrapper(int cropLeft, int cropRight, int cropTop, int cropBottom,
 	, _init(false)
 {}
 
+X11Wrapper::~X11Wrapper()
+{
+	if ( _init )
+	{
+		stop();
+	}
+}
+
 void X11Wrapper::action()
 {
 	if (! _init )