Prefer `completion-table-with-metadata' over explicit completion
table lambdas for clarity. Furthermore prefer it over
`completion-extra-properties' to avoid problems with recursive
minibuffers and recursive completion sessions, since the
completion metadata applies only to the outer completion session.
* lisp/bookmark.el (bookmark-completing-read):
* lisp/faces.el (read-face-name):
* lisp/international/emoji.el (emoji--read-emoji):
* lisp/net/dictionary.el (dictionary-completing-read-dictionary):
* lisp/net/rcirc.el (rcirc-completion-at-point):
* lisp/net/eww.el (eww-read-alternate-url):
* lisp/simple.el (read-from-kill-ring): Use it.
* lisp/calendar/calendar.el (calendar-read-date): Use
`completion-table-with-metadata' and `completion-table-case-fold'.
* lisp/proced.el (proced--read-signal): New function.
(proced-send-signal): Use it.