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/base/edit/widget-save.php

@@ -8,7 +8,7 @@
 <?php if ( ! empty($labels['save_description'])) : ?>
 
 	<p class="wu-mb-5">
-	<?php echo $labels['save_description']; ?>
+	<?php echo wp_kses_post($labels['save_description']); ?>
 	</p>
 
 <?php endif; ?>
@@ -16,7 +16,7 @@
 <div class="wu-bg-gray-200 wu-p-4 wu--m-3 wu--mt-2 wu-border-t wu-border-l-0 wu-border-r-0 wu-border-b-0 wu-border-gray-400 wu-border-solid">
 
 	<button type="submit" name="action" value="save" class="button button-primary wu-w-full">
-	<?php echo $labels['save_button_label']; ?>
+	<?php echo esc_html($labels['save_button_label']); ?>
 	</button>
 
 </div>