add the wxAnimation's ctor which automatically loads a file: it was documented but not present in the actual code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52640 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/animate.h

@@ -23,6 +23,9 @@ WX_DECLARE_LIST_WITH_DECL(wxAnimationDecoder, wxAnimationDecoderList, class WXDL
 class WXDLLIMPEXP_ADV wxAnimation : public wxAnimationBase
 {
 public:
+    wxAnimation(const wxString &name, wxAnimationType type = wxANIMATION_TYPE_ANY)
+        { LoadFile(name, type); }
+
     virtual bool IsOk() const
         { return m_refData != NULL; }