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/versioninfo.h

@@ -0,0 +1,78 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/versioninfo.h
+// Purpose:     declaration of wxVersionInfo class
+// Author:      Troels K
+// Created:     2010-11-22
+// RCS-ID:      $Id:$
+// Copyright:   (c) 2010 wxWidgets team
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_VERSIONINFO_H_
+#define _WX_VERSIONINFO_H_
+
+#include "wx/string.h"
+
+// ----------------------------------------------------------------------------
+// wxVersionInfo: represents version information
+// ----------------------------------------------------------------------------
+
+class wxVersionInfo
+{
+public:
+    wxVersionInfo(const wxString& name,
+                  int major,
+                  int minor,
+                  int micro = 0,
+                  const wxString& description = wxString(),
+                  const wxString& copyright = wxString())
+    {
+        m_name = name;
+        m_major = major;
+        m_minor = minor;
+        m_micro = micro;
+        m_description = description;
+        m_copyright = copyright;
+    }
+
+    // Default copy ctor, assignment operator and dtor are ok.
+
+
+    const wxString& GetName() const { return m_name; }
+
+    int GetMajor() const { return m_major; }
+    int GetMinor() const { return m_minor; }
+    int GetMicro() const { return m_micro; }
+
+    wxString ToString() const
+    {
+        return HasDescription() ? GetDescription() : GetVersionString();
+    }
+
+    wxString GetVersionString() const
+    {
+        wxString str;
+        str << m_name << ' ' << GetMajor() << '.' << GetMinor();
+        if ( GetMicro() )
+            str << '.' << GetMicro();
+
+        return str;
+    }
+
+    bool HasDescription() const { return !m_description.empty(); }
+    const wxString& GetDescription() const { return m_description; }
+
+    bool HasCopyright() const { return !m_copyright.empty(); }
+    const wxString& GetCopyright() const { return m_copyright; }
+
+private:
+    wxString m_name,
+             m_description,
+             m_copyright;
+
+    int m_major,
+        m_minor,
+        m_micro;
+};
+
+#endif // _WX_VERSIONINFO_H_