Some basic BookmarkView drag+drop functionality

src/AppFrame.cpp

@@ -1901,6 +1901,10 @@ int AppFrame::OnGlobalKeyDown(wxKeyEvent &event) {
         return -1;
     }
     
+    if (bookmarkView && bookmarkView->isMouseInView()) {
+        return -1;
+    }
+    
     DemodulatorInstance *demod = nullptr, *lastDemod = wxGetApp().getDemodMgr().getLastActiveDemodulator();
     int snap = wxGetApp().getFrequencySnap();
     
@@ -2002,6 +2006,10 @@ int AppFrame::OnGlobalKeyUp(wxKeyEvent &event) {
         return -1;
     }
 
+    if (bookmarkView && bookmarkView->isMouseInView()) {
+        return -1;
+    }
+
     if (event.ControlDown()) {
         return 1;
     }