New recipe: loading icons from resource section of exe, only on Win32

I've just added a recipe showing how one can load icon data from the
resources section of an application, such as those created using
py2exe, using a gross hack or two. This only works on Win32, of
course, and could use some improvements from those who know a little
more than I do (not hard) about juggling wx.Icon/Image/Bitmap
objects, mainly how to convert from one to the other.

See http://wiki.wxpython.org/index.cgi/LoadIconFromWin32Resources.

-Peter