Add GTK+ config files

dotfiles/config/gtk-2.0/gtkfilechooser.ini

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+[Filechooser Settings]
+StartupMode=cwd
+LocationMode=filename-entry
+ShowHidden=false
+ShowSizeColumn=true
+SortColumn=name
+SortOrder=ascending

dotfiles/config/gtk-3.0/gtk.css

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+.scrollbar {
+  -GtkScrollbar-has-backward-stepper: true;
+  -GtkScrollbar-has-forward-stepper: true;
+  -GtkRange-slider-width: 20;
+  -GtkRange-stepper-size: 20;
+}

dotfiles/config/gtk-3.0/settings.ini

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+[Settings]
+gtk-recent-files-enabled=0
+gtk-primary-button-warps-slider = false
+gtk-toolbar-icon-size=GTK_ICON_SIZE_SMALL_TOOLBAR
+#startup-mode=cwd