Generated new code and added initial data handling

BlendFile/DNA/CustomDataExternal.cs

@@ -17,6 +17,9 @@ namespace BlendFile.DNA {
     public struct CustomDataExternal {
         [DNAFieldAttribute(0, "char", "filename[1024]", 1)]
         public char[] filename = new System.Char[1024];
+        public CustomDataExternal() {
+            this.filename = default;
+        }
         public CustomDataExternal(char[] filename) {
             this.filename = filename;
         }