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Replace directly used deprecated widget GtkCList with GtkTreeView+GtkListStore

Roman Pauer requested to merge roman.pauer/gnome-commander:replace-gtkclist into master

In this request, direct uses of a deprecated widget GtkCList are replaced with GtkTreeView widget using GtkListStore.

I used widget function gtk_tree_model_iter_previous, which is defined in gtk3 but not in gtk2. I implemented the function gtk_tree_model_iter_previous for gtk2 conditionally using GTK_CHECK_VERSION.

GtkCList is also subclassed (GnomeCmdCList) and then used (GnomeCmdCombo, GnomeCmdFileList) - these uses aren't replaced yet.

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