Djay gtk3 propertiesdialog

(In fact, has it's a Widget_RendDesc modification, this affect also Render Dialog)
# Canvas properties dialog
## All tabs 
Replace deprecated [Gtk::HBox](https://developer.gnome.org/gtkmm/stable/deprecated.html#_deprecated000090) and [Gtk::Table](https://developer.gnome.org/gtkmm/stable/deprecated.html#_deprecated000302) using Gtk::Box and Gtk::Grid

## Image Size Tab
* Add toggle button to link height and width pixel
* Add toggle button to link x and y resolution.
* Add a label displaying the current ratio
* Move down image span entry