Invert #[qjs(skip_trace)] -> #[qjs(trace)]

[richarddd]

Isn't it better to tell what to trace than what not to trace in the derive? #[qjs(skip_trace)] should in my opinion be inverted and be used as #[qjs(trace)] on fields we want to trace.

[DelSkayn]

I personally prefer to always lean towards doing the safe and correct thing by default and error when it is not supported. Which I find is how rust generally does things. Failing to trace can result in aborts or memory leaks so this is why I made the macro such that you need to manually mark fields to not be traced making the implementer think about whether a field could contain traceable pointers

[richarddd]

Makes sense!