lib: Rename Node to TreeNode

refs #6630

library/Icinga/Data/Tree/TreeNode.php

@@ -6,7 +6,7 @@ namespace Icinga\Data\Tree;
 use Identifiable;
 use IteratorAggregate;
 
-class Node implements Identifiable, IteratorAggregate
+class TreeNode implements Identifiable, IteratorAggregate
 {
     /**
      * The node's ID
@@ -77,11 +77,11 @@ class Node implements Identifiable, IteratorAggregate
     /**
      * Append a child node as the last child of this node
      *
-     * @param   Node    $child  The child to append
+     * @param   TreeNode    $child  The child to append
      *
      * @return  $this
      */
-    public function appendChild(Node $child)
+    public function appendChild(TreeNode $child)
     {
         $this->children[] = $child;
         return $this;

library/Icinga/Data/Tree/TreeNodeIterator.php

@@ -21,9 +21,9 @@ class TreeNodeIterator implements RecursiveIterator
     /**
      * Create a new iterator over a tree node's children
      *
-     * @param Node $node
+     * @param TreeNode $node
      */
-    public function __construct(Node $node)
+    public function __construct(TreeNode $node)
     {
         $this->children = new ArrayIterator($node->getChildren());
     }