Ensures that intentional backslashes (e.g. "\o/") can be used in:
* Site title
* Site description
* Nav menu name
* Custom Menu widget title
* Tag Cloud widget title
* Text widget body if can't `unfiltered_html`
The latter three are also fixed on the widgets admin page.
Fixes#35898.
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* `default-widgets.php` now requires all of the individual classes
* Move the functions scattered about this file to `widget-functions.php`, which loads before `default-widgets.php`, which only conditionally loads anyway in `wp_maybe_load_widgets()`, which is hooked on `plugins_loaded`
See #33413, #23012.
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