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

src/common/zstream.cpp

@@ -19,6 +19,7 @@
 #if wxUSE_ZLIB && wxUSE_STREAMS
 
 #include "wx/zstream.h"
+#include "wx/versioninfo.h"
 
 #ifndef WX_PRECOMP
     #include "wx/intl.h"
@@ -44,6 +45,14 @@ enum {
 };
 
 
+wxVersionInfo wxGetZlibVersionInfo()
+{
+    return wxVersionInfo("zlib",
+                         ZLIB_VERNUM >> 12,
+                         (ZLIB_VERNUM >> 8) & 0x0F,
+                         (ZLIB_VERNUM & 0xFF) / 0x10);
+}
+
 /////////////////////////////////////////////////////////////////////////////
 // Zlib Class factory