Added a destroy virtual method to all source input plugin main classes

plugins/samplesource/fcdproplus/fcdproplusinput.cpp

@@ -59,6 +59,11 @@ FCDProPlusInput::~FCDProPlusInput()
     closeDevice();
 }
 
+void FCDProPlusInput::destroy()
+{
+    delete this;
+}
+
 bool FCDProPlusInput::openDevice()
 {
     int device = m_deviceAPI->getSampleSourceSequence();

plugins/samplesource/fcdproplus/fcdproplusinput.h

@@ -76,6 +76,7 @@ public:
 
 	FCDProPlusInput(DeviceSourceAPI *deviceAPI);
 	virtual ~FCDProPlusInput();
+	virtual void destroy();
 
 	virtual bool start();
 	virtual void stop();