Some minor code improvements in iCalendar libraryscratch/icalendar

* lisp/calendar/icalendar-mode.el: Update file header.

Fix error display in 'icalendar-errors-mode':

* lisp/calendar/icalendar.el (icalendar-error-regexp): Fix to allow
" *UNFOLDED:" prefix in buffer names.  (Extra colon was breaking match.)
(icalendar-format-error): Suppress this prefix preferentially in long
buffer names.

Add declarations to some iCalendar macros:

* lisp/calendar/icalendar-macs.el (icalendar-with-node-value)
(icalendar-with-child-of)
(icalendar-with-param-of)
(icalendar-with-node-children)
(icalendar-with-node-value)
(icalendar-with-param)
* lisp/calendar/icalendar-ast.el (icalendar-make-property)
(icalendar-make-component)
(icalendar-make-node-from-templates): Add (declare ...) forms.

Add `icalendar-trimp' to icalendar-utils.el:

* lisp/calendar/icalendar-utils.el (icalendar-trimp): New function.
* lisp/calendar/diary-icalendar.el
(diary-icalendar-format-entry)
(diary-icalendar-parse-attendees-and-organizer)
(diary-icalendar-parse-location)
(diary-icalendar-parse-url)
(diary-icalendar-parse-uid): Use it to replace diary-icalendar--nonempty.
(diary-icalendar--nonempty): Remove.

Move VTIMEZONE creation to icalendar-recur.el:

The following changes move `diary-icalendar-current-tz-to-vtimezone' and
associated code to icalendar-recur.el.  Library users are likely to need
this function, so it makes sense to keep it with other time zone-related
code in that file, instead of having them depend on diary-icalendar.

* lisp/calendar/icalendar-recur.el (icalendar-tz-data-insufficient)
(icalendar-tz-unsupported): New error types.
(icalendar-recur-current-tz-to-vtimezone): Rename from
`diary-icalendar-current-tz-to-vtimezone'; signal new error types.
(icalendar-recur--tz-warning): Rename from `diary-icalendar--tz-warning'.
(icalendar-recur--emacs-local-tzid): Rename from
`diary-icalendar--emacs-local-tzid'.
(icalendar-recur--tz-info-sexp-p): Rename from
`diary-icalendar--tz-info-sexp-p'.
* lisp/calendar/diary-icalendar.el
(diary-icalendar-current-tz-to-vtimezone): Reimplement with
`icalendar-recur-current-tz-to-vtimezone'.
(diary-icalendar--tz-warning)
(diary-icalendar--emacs-local-tzid)
(diary-icalendar--tz-info-sexp-p): Renamed and moved; see above.
(diary-time-zone-export-strategy): Update validation function name.

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