Added functionality to create joins using OOD

src/admin/common/models/join/innner.php

@@ -0,0 +1,12 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+class CommonClubsModelJoinInner extends AbstractCommonClubsModelJoin
+{
+    protected function addJoin($q, $str)
+    {
+        $q->innerJoin($str);
+    }
+}

src/admin/common/models/join/left.php

@@ -0,0 +1,12 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+class CommonClubsModelJoinLeft extends AbstractCommonClubsModelJoin
+{
+    protected function addJoin($q, $str)
+    {
+        $q->leftJoin($str);
+    }
+}

src/admin/common/models/join/outer.php

@@ -0,0 +1,12 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+class CommonClubsModelJoinOuter extends AbstractCommonClubsModelJoin
+{
+    protected function addJoin($q, $str)
+    {
+        $q->outerJoin($str);
+    }
+}

src/admin/common/models/join/right.php

@@ -0,0 +1,12 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+class CommonClubsModelJoinRight extends AbstractCommonClubsModelJoin
+{
+    protected function addJoin($q, $str)
+    {
+        $q->rightJoin($str);
+    }
+}