menus: add missing submenus to image-menu.ui.in.in

This makes the remaining submenus in GIMP's menu available for translation. I think I found them all, and see that they only are shown when they have content, so that's nice.

With the new menus, many menu entries added themselves to the menu and created their menu path with gimp_procedure_add_menu_path, but that would not mark the path for translation, so added the submenus to menus/image-menu.ui.in.in as well to fix that.

There is room for some followups, but slightly off topic for this MR, so I'll have a look at those later. Image menu has other order than in 2.10 (ZealousCrop etc. is at the end rather than in the middle), and the Shadow and Light subsubmenus under Shadow and Light only contain half of their contents, the rest being a step up in the hierarchy.