fix(ale_linters/phpcs): add support for multiline error messages

[zanona]

This PR adds support for phpcs when there are errors resulting on messages containing more than one line.

An example would be :

<?php
$foo = 'bar';
echo "
<div>
    <h1>hello world</h1>
    <p>$foo</p>
</div>
";

Before this fix, the command below would return an error, but Ale wouldn't catch it.

$ phpcs --report=emacs theme/single-member.php
/home/user/file-name.php:14:10: error - All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '"
'.

[zanona]

Unrelated test error at /testplugin/test/command_callback/test_bingo_command_callback.vader

[stale]

This pull request has been automatically marked as stale because it has not been updated recently. Make sure to write tests and document your changes. See :help ale-dev for information on writing tests.
If your pull request is good to merge, bother w0rp or another maintainer again, and get them to merge it.

[zanona]

Rebasing seems to have fixed tests, as it was unrelated. cc / @w0rp

[stale]

This pull request has been automatically marked as stale because it has not been updated recently. Make sure to write tests and document your changes. See :help ale-dev for information on writing tests.
If your pull request is good to merge, bother w0rp or another maintainer again, and get them to merge it.

[zanona]

@w0rp could you please point someone to review this PR? I'm not quite sure what else I could've done here. Tests passed and all...

[w0rp]

This is all good, I've just been too busy to look at ALE pull requests in recent months.

[w0rp]

Cheers! 🍻