Move HTML render from code to Twig templates to allow translation.

Problem/Motivation

Can't use translated text in 'additional_html'. Need flexibility in HTML markup.

Proposed resolution

Move all functionality which render HTML from 'addtoany.module' to Twig templates.

Remaining tasks

May be problem with latest dev version when merge.

User interface changes

None.

API changes

None.

Data model changes

None.

I discovered that AddToAny module doesn't use potential of Twig Engine to render HTML, so I created a patch that moves logic of rendering HTML in 'addtoany.module' to Twig template addtoany-standard.html.twig with additional variables. It gives us flexibility with text translation.

Also applied Drupal coding standards to the files, so you would notice there are changes in code style.