Allow `declare' to set the interactive-only property

Allow `declare' to set the interactive-only property

* lisp/emacs-lisp/byte-run.el (defun-declarations-alist):
Add interactive-only.  Doc tweak.
(macro-declarations-alist): Doc tweak.

* lisp/subr.el (declare): Doc tweak (add xref to manual).

* lisp/comint.el (comint-run):
* lisp/files.el (insert-file-literally, insert-file):
* lisp/replace.el (replace-string, replace-regexp):
* lisp/simple.el (beginning-of-buffer, end-of-buffer, delete-backward-char)
(delete-forward-char, goto-line, insert-buffer, next-line)
(previous-line): Set interactive-only via declare.

* doc/lispref/functions.texi (Declare Form): Add interactive-only.

* doc/lispref/commands.texi (Defining Commands) Mention declare.

* etc/NEWS: Mention this.