The `$path` parameter of some script translation functions had a default value of `null`, even though the parameter is documented as a string.
This commit corrects the default value for `$path` in:
* `WP_Dependency::set_translations()`
* `WP_Scripts::set_translations()`
* `wp_set_script_translations()`
Additionally, this commit removes an `is_string()` check for `$path` in `load_script_textdomain()`. Now that the default value for `$path` in that function has also been corrected to an empty string instead of `null`, that check is no longer necessary, as it would ''hide'' an error which should be ''fixed'' (at the source of the problem) instead.
Follow-up to [54349].
Props jrf, johnjamesjacoby.
See #55967, #55656.
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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.
Built from https://develop.svn.wordpress.org/trunk@54254
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Sergey Biryukov