Generated new code and added initial data handling

BlendFile/DNA/SpreadsheetColumnID.cs

@@ -17,6 +17,9 @@ namespace BlendFile.DNA {
     public class SpreadsheetColumnID {
         [DNAFieldAttribute(0, "char", "*name", 1)]
         public char ptr_name;
+        public SpreadsheetColumnID() {
+            this.ptr_name = default;
+        }
         public SpreadsheetColumnID(char ptr_name) {
             this.ptr_name = ptr_name;
         }