Changeset 45663 for trunk/src/wp-includes/class-oembed.php

Coding Standards: Move wp-includes/class-oembed.php to wp-includes/class-wp-oembed.php.

This renames the file containing the WP_oEmbed class to conform to the coding standards.

This commit also includes:

• A new class-oembed.php that includes the new file, for anyone that may've been including the file directly.
• Replaces references to the old filename with the new filename.

See #47632.