improve indentation when printing out objects in mismatch error

[bertvanbrakel]

when printing log lists of dto's, child dtos need to be indented correctly.

Maybe detect if child contains new lines,if it does, indent, if not, same line. Possibly be
able to do this in a generic way.

Currently if have

FooDto {
String MyProp {get;set;}
ChildDto Child {get;set;}
}

the child properties are printed at the same indentation as the properties of FooDto. Possibly use a json printer?