Prep Plugin for release on WordPress.org (#23)

* Update translation text domain
* Escape everything that should be escaped.
* Add nonce checks where needed.
* Sanitize all inputs.
* Apply Code style changes across the codebase.
* Correct many deprecation notices.
* Optimize load order of many filters.
* Add Proper Build script
* Use emojii flags
* Fix i18n deprecation  notice for translating too early
* Put all scripts in footer and load async

views/checkout/register.php

@@ -11,7 +11,7 @@
 		'product-fields',
 		$product_fields,
 		[
-			'title' => __('Products', 'wp-ultimo'),
+			'title' => __('Products', 'wp-multisite-waas'),
 			'views' => 'checkout/fields',
 		]
 	);