bug#63469: 29.0.90; project.el doesn't add menu-bar entries

[Juri Linkov]

> Extra idea: Maybe we could have a submenu which lists all the projects,
> and then has a subsubmenu to run commands in the context of that
> project?  This could replace the current menu entry for
> project-switch-project.
>
> So for example, if I have an emacs-29 project:
>
> Tools -> Project -> emacs-29 -> Open File...
> Tools -> Project -> emacs-29 -> Dired
>
> (maybe the menu entries could be named with project-name, as I have
> here, so they're shorter)

OT1H, it would be simpler to switch projects.  OTOH, the menus will be
quite long.