Requests has its own cookie object in form of `Requests_Cookie`. Therefore we have to convert `WP_Http_Cookie` objects to `Requests_Cookie`.
This introduces `WP_Http_Cookie::get_attributes()` to retrieve cookie attributes of a `WP_Http_Cookie` object and `WP_Http::normalize_cookies()` to convert the cookie objects.
Fixes#37437.
Built from https://develop.svn.wordpress.org/trunk@38164
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`class-http.php` requires functions from `http.php`, so loading it by itself wouldn't have worked.
Creates:
`class-wp-http-cookie.php`
`class-wp-http-curl.php`
`class-wp-http-encoding.php`
`class-wp-http-proxy.php`
`class-wp-http-streams.php`
`http-functions.php`
`WP_Http` remains in `class-http.php`.
`http.php` contains only top-level code. Class files only contain classes. Functions file only contains functions.
See #33413.
Built from https://develop.svn.wordpress.org/trunk@33748
git-svn-id: http://core.svn.wordpress.org/trunk@33716 1a063a9b-81f0-0310-95a4-ce76da25c4cd
