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

plugins/samplesource/limesdrinput/limesdrinput.cpp

@@ -67,6 +67,11 @@ LimeSDRInput::~LimeSDRInput()
     resumeBuddies();
 }
 
+void LimeSDRInput::destroy()
+{
+    delete this;
+}
+
 bool LimeSDRInput::openDevice()
 {
     if (!m_sampleFifo.setSize(96000 * 4))

plugins/samplesource/limesdrinput/limesdrinput.h

@@ -230,6 +230,7 @@ public:
 
     LimeSDRInput(DeviceSourceAPI *deviceAPI);
     virtual ~LimeSDRInput();
+    virtual void destroy();
 
     virtual bool start();
     virtual void stop();