Add wxVersionInfo and functions returning it for 3rd party libraries.

Add simple wxVersionInfo class holding the version information.

Also add GetLibraryVersionInfo() static method to wx{JPEG,PNG,TIFF}Handler,
wxStyledTextCtrl and wxXmlDocument classes and wxGetZlibVersionInfo() and
wxGetLibraryVersionInfo() global functions using it.

Closes #12690.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66259 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/utils.h

@@ -20,6 +20,7 @@
 #include "wx/list.h"
 #include "wx/filefn.h"
 #include "wx/hashmap.h"
+#include "wx/versioninfo.h"
 #include "wx/meta/implicitconversion.h"
 
 #if wxUSE_GUI
@@ -140,6 +141,8 @@ WXDLLIMPEXP_BASE void wxBell();
 WXDLLIMPEXP_CORE void wxInfoMessageBox(wxWindow* parent);
 #endif // wxUSE_MSGDLG
 
+WXDLLIMPEXP_BASE wxVersionInfo wxGetLibraryVersionInfo();
+
 // Get OS description as a user-readable string
 WXDLLIMPEXP_BASE wxString wxGetOsDescription();