Sync changes v29.0.0 from IceHrmPro (https://icehrm.com/purchase-icehrmpro)

core/src/Classes/IceExtension.php

@@ -0,0 +1,20 @@
+<?php
+namespace Classes;
+
+abstract class IceExtension extends AbstractModuleManager
+{
+    public function initializeUserClasses()
+    {
+        // TODO: Implement initializeUserClasses() method.
+    }
+
+    public function initializeFieldMappings()
+    {
+        // TODO: Implement initializeFieldMappings() method.
+    }
+
+    public function initializeDatabaseErrorMappings()
+    {
+        // TODO: Implement initializeDatabaseErrorMappings() method.
+    }
+}