Add Kint functionality to Twig templates

This is a big enough piece of code that it is going to need a Maintainer. Would anyone be up for that? It could be the same as the kint module maintainer or someone else.

Code looks fine. Would be ideal if someone tested this before commit.

+        ob_start();
+        \Kint::dump($kint_args);
+        $result = ob_get_clean();

Can be replaced by @\Kint::dump($kint_args);. This did not work with prior version of kint but now that we are on 1.0.0-wip branch it does.

@Cottser
The @ operator is used by Kint as a "modifier".

@Kint::dump(); will return the output of the Kint::dump() instead of displaying it on screen.

http://raveren.github.io/kint
So, there is no need to capture the buffer output, just use the value returned.

I think you posted the interdiff twice.

11: devel-2218949-11.patch queued for re-testing.

How can I get this tested again? I am seeing yellow, not green.

Committed. We should document this somewhere.

This is great! I think it might make sense to add documentation for this feature on the Debugging variables in Twig templates (https://drupal.org/node/1906780) or else add a page to that section called "Debugging Twig templates using Devel and Kint."

Would that be a good place for this documentation to live? Other suggestions?

Also, FWIW, I am writing up a blog post on debugging Twig in D8 which will be published on the Drupalize.Me blog next Tuesday and I will include a bit about using kint() in a twig template file.

A note for the documentation, twig_debug must be turned on in settings.php, or nothing happens. Should be the first sentence IMO. That caught me when trying it out today:)

Did a google search for drupal and kint and landed here. Followed Amber's link and noticed the Theming handbook still doesn't have docs about kint(). So I added them. https://www.drupal.org/node/1906780#kint

dump() is hard to use. kint() is easier.

@JohnAlbin thanks for the doc update! note that you can also use {{ devel_dump() }} and {{ devel_message() }} (and their aliases kpr, dpm, dsm) and take advantage of the pluggable dumper system