core/debugger: Define defaulted virtual destructors

Resolves an MSVC warning where a virtual destructor is not defined in the base class with virtual functions.

src/core/debugger/debugger.cpp

@@ -50,7 +50,7 @@ public:
         InitializeServer(port);
     }
 
-    ~DebuggerImpl() {
+    ~DebuggerImpl() override {
         ShutdownServer();
     }