Cleanup unused var warnings

Clean up compiling output so that actual issues can be spotted. Remove multiple
cases of unused parameter. Remove unused isActive at startup. (demod is started
regardless)

src/forms/SDRDevices/SDRDevices.cpp

@@ -19,7 +19,7 @@ SDRDevicesDialog::SDRDevicesDialog( wxWindow* parent ): devFrame( parent ) {
     dev = nullptr;
 }
 
-void SDRDevicesDialog::OnClose( wxCloseEvent& event ) {
+void SDRDevicesDialog::OnClose( wxCloseEvent& /* event */) {
     wxGetApp().setDeviceSelectorClosed();
     Destroy();
 }
@@ -173,7 +173,7 @@ void SDRDevicesDialog::OnSelectionChanged( wxTreeEvent& event ) {
     event.Skip();
 }
 
-void SDRDevicesDialog::OnAddRemote( wxMouseEvent& event ) {
+void SDRDevicesDialog::OnAddRemote( wxMouseEvent& /* event */) {
     if (removeId != nullptr) {
         SDRDeviceInfo *selDev = getSelectedDevice(removeId);
 
@@ -233,7 +233,7 @@ SDRDeviceInfo *SDRDevicesDialog::getSelectedDevice(wxTreeItemId selId) {
     return NULL;
 }
 
-void SDRDevicesDialog::OnUseSelected( wxMouseEvent& event ) {
+void SDRDevicesDialog::OnUseSelected( wxMouseEvent& /* event */) {
     if (dev != NULL) {
         int i = 0;
         SoapySDR::ArgInfoList::const_iterator args_i;
@@ -376,7 +376,7 @@ void SDRDevicesDialog::OnDeviceTimer( wxTimerEvent& event ) {
     }
 }
 
-void SDRDevicesDialog::OnRefreshDevices( wxMouseEvent& event ) {
+void SDRDevicesDialog::OnRefreshDevices( wxMouseEvent& /* event */) {
     doRefreshDevices();
 }
 
@@ -407,7 +407,7 @@ void SDRDevicesDialog::OnPropGridChanged( wxPropertyGridEvent& event ) {
     }
 }
 
-void SDRDevicesDialog::OnPropGridFocus( wxFocusEvent& event ) {
+void SDRDevicesDialog::OnPropGridFocus( wxFocusEvent& /* event */) {
     editId = selId;
 }
 
@@ -429,4 +429,4 @@ void SDRDevicesDialog::doRefreshDevices() {
     dev = nullptr;
     refresh = true;
     m_addRemoteButton->SetLabel("Add");
-}
+}