Silence many eshell compilation warnings

Silence many eshell compilation warnings

* lisp/eshell/em-tramp.el: Adjust requires.
(eshell-parse-command): Autoload.

* lisp/eshell/em-xtra.el: Adjust requires.
(eshell-parse-command): Autoload.

* lisp/eshell/esh-ext.el: Adjust requires.
(eshell-parse-command, eshell-close-handles): Autoload.

* lisp/eshell/esh-io.el: Adjust requires.
(eshell-output-filter): Autoload.

* lisp/eshell/esh-util.el: No need to load tramp when compiling.
(tramp-file-name-structure, ange-ftp-ls, ange-ftp-file-modtime): Declare.
(eshell-parse-ange-ls): Require ange-ftp and tramp.

* lisp/eshell/em-alias.el, lisp/eshell/em-banner.el, lisp/eshell/em-basic.el:
* lisp/eshell/em-cmpl.el, lisp/eshell/em-glob.el, lisp/eshell/em-pred.el:
* lisp/eshell/em-prompt.el, lisp/eshell/em-rebind.el, lisp/eshell/em-smart.el:
* lisp/eshell/em-term.el, lisp/eshell/esh-arg.el, lisp/eshell/esh-mode.el:
* lisp/eshell/esh-opt.el, lisp/eshell/esh-proc.el:
* lisp/eshell/esh-var.el: Adjust requires.

* lisp/eshell/eshell.el: Do not require esh-util twice.
(eshell-add-input-to-history): Declare.
(eshell-command): Check history module is active before using it.