[Tree] Begin using mct-tree for tree representation

platform/commonUI/general/res/templates/subtree.html

@@ -19,18 +19,6 @@
  this source code distribution or the Licensing information page available
  at runtime from the About dialog for additional information.
 -->
-<ul class="tree">
-    <li ng-if="!composition">
-        <span class="tree-item">
-            <span class="icon wait-spinner"></span>
-            <span class="title-label">Loading...</span>
-        </span>
-    </li>
-    <li ng-repeat="child in composition">
-        <mct-representation key="'tree-node'"
-                            mct-object="child"
-                            parameters="parameters"
-                            ng-model="ngModel">
-        </mct-representation>
-    </li>
-</ul>
+<mct-tree mct-object="domainObject">
+</mct-tree>
+