Use "= default" for all trivial default ctors and dtors

Replace user-specified empty constructors and destructors with the
compiler-generated versions, which has a number of advantages for code
generation, in addition to being more clear.

Closes #22965.

Closes #24058.

include/wx/aui/framemanager.h

@@ -160,7 +160,7 @@ public:
         DefaultPane();
     }
 
-    ~wxAuiPaneInfo() {}
+    ~wxAuiPaneInfo() = default;
 
     // Write the safe parts of a newly loaded PaneInfo structure "source" into "this"
     // used on loading perspectives etc.