further untangle generic and native GTK implementations of wxScrollHelper: use the standard wxScrollHelperBase/wxScrollHelper naming convention and move the stuff unused by GTK in the generic implementation
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57531 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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