Add wxIcon::CreateFromHICON() to wxMSW.

Provide a public method properly assigning an HICON to wxIcon, instead of
asking people to call SetHICON() and SetSize().

Closes #15023.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73489 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/icon.h

@@ -65,6 +65,8 @@ public:
                           wxBitmapType type = wxICON_DEFAULT_TYPE,
                           int desiredWidth = -1, int desiredHeight = -1);
 
+    bool CreateFromHICON(WXHICON icon);
+
     // implementation only from now on
     wxIconRefData *GetIconData() const { return (wxIconRefData *)m_refData; }