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

inc/objects/class-note.php

@@ -195,17 +195,17 @@ class Note {
 
 		$fields['text'] = [
 			'type'  => 'text',
-			'title' => __('Text', 'wp-ultimo'),
+			'title' => __('Text', 'wp-multisite-waas'),
 		];
 
 		$fields['author_id'] = [
 			'type'  => 'number',
-			'title' => __('Author ID', 'wp-ultimo'),
+			'title' => __('Author ID', 'wp-multisite-waas'),
 		];
 
 		$fields['note_id'] = [
 			'type'  => 'text',
-			'title' => __('Note ID', 'wp-ultimo'),
+			'title' => __('Note ID', 'wp-multisite-waas'),
 		];
 
 		uasort($fields, 'wu_sort_by_order');