Generated new code and added initial data handling

BlendFile/DNA/FileHandler.cs

@@ -17,6 +17,9 @@ namespace BlendFile.DNA {
     public class FileHandler {
         [DNAFieldAttribute(0, "FileHandlerTypeHandle", "*type", 0)]
         public FileHandlerTypeHandle ptr_type;
+        public FileHandler() {
+            this.ptr_type = default;
+        }
         public FileHandler(FileHandlerTypeHandle ptr_type) {
             this.ptr_type = ptr_type;
         }