Revisit naming of "renderers" in the page building pipeline

Fixing typos that hinder legibility.

I searched all of core for the string "RenderHtmlRenderer" and couldn't find one. Did I miss something, or does that not exist anymore.

Also, HtmlFragmentRenderer and HtmlPageRenderer doesn't exist. But DefaultHtmlFragmentRenderer.php and DefaultHtmlPageRenderer.php exist as well as HtmlFragmentRendererInterface.php and HtmlPageRendererInterface.php.

Let's be clear of what we're talking about here.

Renderer seems like an appropriate name to me. But for the sake of argument here are a few alternatives:
http://www.thesaurus.com/browse/render

Producer
Maker
Deliverer
Interpreter
Performer
Contributor
Provider

also some that weren't included

Hydrator
Builder
Processor
Compiler

I'm assuming you want to keep the er pattern.

Render is the action, shouldn't a HtmlPage or HtmlFragment know how to render themselves via a render() method and/or a __toString()?

"View" would be what I'd prefer(bias), but may get confused with Views which seems to be why we call everything "render" or "renderable"

Likely over simplifying things but thought I'd throw it out there, the View that I'm familiar with most is from Kohana which is very similar to an HtmlFragment in that they use HMVC pattern (sub controller calls from within other parts of the system with their own view(fragment) returns like a server side ajax call.

https://github.com/kohana/core/blob/3.4/develop/classes/Kohana/View.php#...

This ends in a beauty like this:

  print View::factory() 
    ->set_filename('template.html.twig')
    ->set(['food' => 'bread', 'beverage' => 'water']); // Data for template.

Ignore me... I don't know what HtmlPage/Fragment is really doing yet to say anything constructive...

And I can do mostly that View::factory thing with this:

  print \Drupal::service('twig')->render('template.html.twig', ['food' => 'bread', 'beverage' => 'water']);

This issue might be on the right track; see:
http://objology.blogspot.com/2011/09/one-of-best-bits-of-programming-adv...

Renderer made the list of Objects that tend to have better names.

Should we switch our thinking into having the ability to render be an interface. We could call it Renderable. Then anything that has the Renderable interface could be renderable.

Fixed by #2352155: Remove HtmlFragment/HtmlPage.