Sample sink plugins: removed useless init pure virtual method

plugins/samplesink/hackrfoutput/hackrfoutput.cpp

@@ -53,11 +53,6 @@ HackRFOutput::~HackRFOutput()
 	m_deviceAPI->setBuddySharedPtr(0);
 }
 
-bool HackRFOutput::init(const Message& cmd)
-{
-	return false;
-}
-
 bool HackRFOutput::start(int device)
 {
 //	QMutexLocker mutexLocker(&m_mutex);

plugins/samplesink/hackrfoutput/hackrfoutput.h

@@ -71,7 +71,6 @@ public:
 	HackRFOutput(DeviceSinkAPI *deviceAPI);
 	virtual ~HackRFOutput();
 
-	virtual bool init(const Message& message);
 	virtual bool start(int device);
 	virtual void stop();
 

plugins/samplesink/hackrfoutput/hackrfoutputplugin.cpp

@@ -29,7 +29,7 @@
 
 const PluginDescriptor HackRFOutputPlugin::m_pluginDescriptor = {
 	QString("HackRF Output"),
-	QString("3.3.3"),
+	QString("3.4.0"),
 	QString("(c) Edouard Griffiths, F4EXB"),
 	QString("https://github.com/f4exb/sdrangel"),
 	true,