Updated TODO
Seal needed deprecated API.
Sealed deprecated functions gtk_widget_get_margin_left() and
gtk_widget_get_margin_right()
Replaced deprecated functions

gtk_button_new_from_stock()     -> gtk_button_new_from_icon_name()
gtk_widget_render_icon_pixbuf() -> gtk_icon_theme_load_icon()
gtk_widget_set_margin_left()    -> gtk_widget_set_margin_start()

Stock images with icon names
GTK_STOCK_ADD     -> "list-add"
GTK_STOCK_REMOVE  -> "list-remove"
GTK_STOCK_OPEN    -> "document-open"
GTK_STOCK_GO_DOWN -> "go-down"
GTK_STOCK_DIALOG_WARNING -> "dialog-warning"
GTK_STOCK_INFO    -> "dialog-information"
GTK_STOCK_SAVE    -> "document-save"
GTK_STOCK_REFRESH -> "view-refresh"
Migrated from stock icons to icon names

GladeApp GladePointerMode icons and devhelp icon are now registered as icon names

GladeWindow: replaced deprecated gtk_tool_button_new_from_stock() with
gtk_tool_button_new() + gtk_image_new_from_icon_name() to create actions tool items

GTK+ Catalog, glade.glade: replaced every stock icon with the corresponding icon name
TODO: the only stock icon that does not seem to have a replacement is gtk-edit
GladePopup: do not use deprecated GtkImageMenuItem
GladePreviewer: Fixed bug previewing templates.

XML text data was not escaped when generating the template XML.
GladePreviewer: ignore signal connections to avoid warnings about missing symbols.
GladePreviewWindow: force infobar to show a close button and make label selectable
GladePreviewer: show handler information in infobar when a signal is emited.
Added --print-handler option (print handlers info on stdout)