Menu bar rearrangements, move Print menu items to submenu, etc. (bug#37594)

Menu bar rearrangements, move Print menu items to submenu, etc. (bug#37594)

* lisp/menu-bar.el (menu-bar-print-menu): New defvar.
(menu-bar-file-menu): Move print entries to submenu.
Add menu entries for tab-new, tab-close, make-frame-on-monitor.
(menu-bar-showhide-menu): Add menu entry for global-tab-line-mode.
Don't add toggle-tab-bar-mode-from-frame on ns where it's unavailable.
(menu-bar-tools-menu): Add rgrep.

* lisp/bindings.el (next-buffer, previous-buffer): Advertise bindings
'C-x right' and 'C-x left' instead of 'XF86Forward' and 'XF86Back'.