The icons are embedded as PNG images directly in the source code to avoid the
need for installing them. This does make the library larger though so provide
a wxUSE_ARTPROVIDER_TANGO option to turn the new code and associated bloat off.
Also turn it off by default under wxGTK as the native art provider is used
there anyhow.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66505 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
