Coding Standards: Rename WordPress Dependencies API class files.

The current coding standards note that the name of the class files should be based on the class name with `class-` prepended, and the underscores replaced by hyphens (see the [https://developer.wordpress.org/coding-standards/wordpress-coding-standards/php/#naming-conventions Naming Conventions] section in the handbook), except for the three legacy files: `class.wp-dependencies.php`, `class.wp-scripts.php`, `class.wp-styles.php`.

To bring more consistency to the codebase and make it easier to implement autoloading in the future, this commit renames those three legacy files to conform to the coding standards:

* `wp-includes/class.wp-dependencies.php` → `wp-includes/class-wp-dependencies.php`
* `wp-includes/class.wp-scripts.php` → `wp-includes/class-wp-scripts.php`
* `wp-includes/class.wp-styles.php` → `wp-includes/class-wp-styles.php`

Includes:
* Loading the new files from the old ones, for anyone that may have been including the files directly.
* Replacing references to the old filenames with the new filenames.

Follow-up to [7970], [45654], [45662], [45663], [45678], [47197], [52026], [53749].

Props afragen, schlessera, swissspidy, dingo_d, hellofromTonya, SergeyBiryukov.
Fixes #37861. See #55647.

git-svn-id: https://develop.svn.wordpress.org/trunk@54254 602fd350-edb4-49c9-b593-d223f7449a82

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