Convert node_uri() to $node->uri()

There has been no discussion yet what exactly should happen with uri callbacks. Before we can do this, we need to discuss that first. Right now, it's possible to alter the callback, also for a specific bundle, this would kill that possibility.

@Berdir the alterability still there (see forum_entity_bundle_info_alter()), so we just moving code to where it belongs and cleaning procedural remains

The alterability/callbacks is implemented in the label/uri methods in Entity. If you override those methods in Node, you can alter all you want, it won't have any effect.

In 7.x, entity.module has the concept of defaultLabel() and defaultUri() which allows to work around that.

@Berdir anyway let's discuss this in #2010184: [meta] convert ‘uri_callback’ entities param to EntityInterface::uri() method

To trigger node_uri(), you'd need to use $entity->urlInfo('something') where something is not a valid link relationship.
$node->url('something') will always return an empty string.

So, let's remove it.

Another trivial one :)

node_uri was a drupal 7 function. Need a change record. I guess all the *_uri removals should share a change record.

Discussed with @Berdir in IRC - "that was never an API, it was just an internal callback, do we really need a change record for that?" , "we will need a change record for removing the uri_callback feature, but I think we can do that in the parent issue when they're all gone?"

I agree.

Committed 2aa9831 and pushed to 8.x. Thanks!