cleanup: autocmd_in_use
cleanup: RequestQueued autocmd Event
cleanup: arh: remove some DEBUG
auto-response-header: man correction

correct mandoc error: unterminated quoted argument
auto-response-header: rewrite arh_parse

`auto-response-header` setting is a list.

Each element has format: "pattern header-list".
If an element contains COMMA, the element must by enclosed by QUOTE.

The header-list format is like `header` setting.