* lisp/shell.el: Use lexical-binding and std completion UI.

(shell-filter-ctrl-a-ctrl-b): Work as a preoutput filter.
(shell-mode): Put shell-filter-ctrl-a-ctrl-b on
comint-preoutput-filter-functions rather than on
comint-output-filter-functions.
(shell-command-completion, shell--command-completion-data)
(shell-filename-completion, shell-environment-variable-completion)
(shell-c-a-p-replace-by-expanded-directory): New functions.
(shell-dynamic-complete-functions, shell-dynamic-complete-command)
(shell-dynamic-complete-filename, shell-replace-by-expanded-directory)
(shell-dynamic-complete-environment-variable): Use them.
(shell-dynamic-complete-as-environment-variable)
(shell-dynamic-complete-as-command): Remove.
(shell-match-partial-variable): Match past point.
* lisp/comint.el: Clean up use of completion-at-point-functions.
(comint-completion-at-point): New function.
(comint-mode): Use it completion-at-point-functions.
(comint-dynamic-complete): Make it obsolete.
(comint-replace-by-expanded-history-before-point): Add dry-run arg.
(comint-c-a-p-replace-by-expanded-history): New function.
(comint-dynamic-complete-functions)
(comint-replace-by-expanded-history): Use it.
* lisp/minibuffer.el (completion-table-with-terminator): Allow dynamic
termination strings.  Try harder to avoid second try-completion.
(completion-in-region-mode-map): Disable bindings that don't work yet.

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