Implement WHMCS Addon Dashboard with API for stats and integrate billing provider logic

integrations/whmcs/modules/addons/hexagamecloud/templates/events.tpl

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+<div class="panel panel-default">
+  <div class="panel-heading">
+    <h3 class="panel-title">GameCloud Events</h3>
+  </div>
+  <div class="panel-body">
+    <p>
+      <a href="{{modulelink}}" class="btn btn-default">Dashboard</a>
+      <a href="{{modulelink}}&action=poll" class="btn btn-primary">Poll &amp; auto-ack</a>
+    </p>
+    <p>Pending local copies: <strong>{{pendingCount}}</strong> · Dead letter: <strong>{{deadLetterCount}}</strong></p>
+    <table class="table table-bordered table-condensed">
+      <thead>
+        <tr>
+          <th>ID</th>
+          <th>Type</th>
+          <th>Status</th>
+          <th>Payload</th>
+          <th>Created</th>
+          <th>Actions</th>
+        </tr>
+      </thead>
+      <tbody>
+        {{events.rows}}
+      </tbody>
+    </table>
+  </div>
+</div>