Core - Make reset CSS configurable

[joaopaulovieira]

Summary

This PR creates the possibility to don't use nested-reset CSS mixin when the new option resetStyle is configured with the false value. One default value for resetStyle option is created to maintain the current behavior.

Also, the style injection is changed to allow the new feature.

The path pattern to access modules is updated to use the src alias on all files where is necessary to update the style injection.

Changes

• rollup.config.js:
  • Config the rollup-plugin-postcss to enable inject style on the element itself instad the head page
• player.js:
  • Create default value (true) for resetStyle option
• core/public/style.scss:
  • Remove nested-reset CSS mixin
• core/public/optional.scss:
  • Add nested-reset CSS mixin
• core.js:
  • Add optional.scss accordingly the resetStyle value
• core.js/container.js/html5_video.js/html_img.js/no_op.js:
  • Use src path alias to import modules;
  • Inject style on the element itself instead the head page;

How to test

• Run public page;
• Check the head tag on the page;
  • Should not have any anonymous style of any player component;
• Check any player element;
  • Should have the style related on the same level;
• Check core element on the page;
  • Should have two style elements (CoreStyle and OptionalStyle);
• Set resetStyle option with the false value;
  • Should have only one style element (CoreStyle);

A picture tells a thousand words

Before this PR

After this PR

With resetStyle = true

With resetStyle = false

[hound]

Prefer double-quoted strings