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

assets/js/dns-table.js

@@ -0,0 +1,45 @@
+(function($) {
+
+    wu_dns_table = new Vue({
+        el: '#wu-dns-table',
+        data: {
+            error: null,
+            results: {},
+            loading: true,
+        },
+        updated() {
+            this.$nextTick(function() {
+
+                window.wu_initialize_tooltip();
+
+            });
+        }
+    })
+
+    $(document).ready(function() {
+
+        $.ajax({
+            url: ajaxurl,
+            data: {
+                action: 'wu_get_dns_records',
+                domain: '<?php echo esc_js($domain->get_domain()); ?>',
+            },
+            success: function(data) {
+
+                Vue.set(wu_dns_table, 'loading', false);
+
+                if (data.success) {
+
+                    Vue.set(wu_dns_table, 'results', data.data);
+
+                } else {
+
+                    Vue.set(wu_dns_table, 'error', data.data);
+
+                }
+
+            },
+        })
+
+    });
+})(jQuery);