Web API: implemented device run APIs for Airspy, FCD Pro, FCD Pro+ and File Source i.e. the rest of source device plugins

plugins/samplesource/fcdpro/fcdproinput.h

@@ -110,7 +110,16 @@ public:
 
 	virtual bool handleMessage(const Message& message);
 
-	void set_center_freq(double freq);
+    virtual int webapiRunGet(
+            SWGSDRangel::SWGDeviceState& response,
+            QString& errorMessage);
+
+    virtual int webapiRun(
+            bool run,
+            SWGSDRangel::SWGDeviceState& response,
+            QString& errorMessage);
+
+    void set_center_freq(double freq);
 	void set_bias_t(bool on);
 	void set_lnaGain(int index);
 	void set_rfFilter(int index);