Add wxTopLevelWindow::SetContentProtection()

This method allows to exclude a top level window from screen captures.
Windows 7 or newer is required and any macOS version is supported.
Other platforms are not implemented and will return false.

The display example has been extended to demo this ability.

Closes #22066.

include/wx/msw/missing.h

@@ -398,6 +398,18 @@
 
 #ifndef MUI_LANGUAGE_NAME
 #define MUI_LANGUAGE_NAME 0x8
+#endif
+
+#ifndef WDA_NONE
+#define WDA_NONE 0x0
+#endif
+
+#ifndef WDA_MONITOR
+#define WDA_MONITOR 0x1
+#endif
+
+#ifndef WDA_EXCLUDEFROMCAPTURE
+#define WDA_EXCLUDEFROMCAPTURE 0x11
 #endif
 
  /*