Improve icomplete-vertical-mode and fido-vertical-mode

This mode is intended to be used with Icomplete ('M-x icomplete-mode')
or Fido ('M-x fido-mode'), to display the list of completions
candidates vertically instead of horizontally.  When used with
Icomplete, completions are rotated and selection kept at the top.
When used with Fido, completions scroll like a typical dropdown
widget.

If the dropdown behaviour is desired for Icomplete (instead of
rotation), icomplete-scroll can be adjusted separately by the user.

* etc/NEWS (icomplete-vertical-mode): Reword.

* lisp/icomplete.el (simple): Require it.
(icomplete-selected-match): New face.
(icomplete-scroll): New user-visible var.
(icomplete-forward-completions): Rework.
(icomplete-backward-completions): Rework.
(icomplete--fido-mode-setup): Prefer icomplete-scroll according to
icomplete-vertical mode.
(icomplete-minibuffer-setup): Initialize icomplete--scrolled-completions.
(fido-vertical-mode): An alias for icomplete-vertical-mode.
(icomplete-exhibit): Init icomplete--scrolled-past.  Adjust overlay.
(icomplete--render-vertical): New helper.
(icomplete--sorted-completions): If cache is stale, also
invalidate icomplete--scrolled-past.
(icomplete-completions): Rework.  Mostly reformat.

* lisp/simple.el (max-mini-window-lines): New helper.
(display-message-or-buffer): Use it.

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