Filter as many DiffNodes in Starfold as possible

This saves memory by shortening the list of possible candidates.

Author: ibbem

src/main/java/org/variantsync/diffdetective/diff/difftree/transform/Starfold.java

@@ -29,13 +29,11 @@ public static Starfold IgnoreNodeOrder() {
     @Override
     public void transform(DiffTree diffTree) {
         // All non-artifact nodes are potential roots of stars.
-        final List<DiffNode> macroNodes = diffTree.computeAllNodesThat(node -> !node.isCode());
-//        System.out.println("Inspecting " + macroNodes.size() + " star root candidates.");
+        final List<DiffNode> macroNodes = diffTree.computeAllNodesThat(Starfold::isStarRoot);
+//        System.out.println("Inspecting " + macroNodes.size() + " star roots.");
         for (DiffNode macro : macroNodes) {
-            if (isStarRoot(macro)) {
-//                System.out.println("Found star root " + macro);
-                foldStar(macro);
-            }
+//            System.out.println("Found star root " + macro);
+            foldStar(macro);
         }
     }