Put the evaluated object into scope when using --repl --eval

[jwiegley]

Pinging @hSloan, who asked for this feature. It should just be a matter of checking whether the evaluated object is an attrset, and if so, wrapping the call that enters the repl in a call to pushScope.

[hSloan]

Thanks for reminding me, I'm picking this one up.

[domenkozar]

@hSloan are you working on this? I'm working on extending repl with scope state and type command support.

[mightybyte]

@domenkozar He was working on it yesterday.

[domenkozar]

I made a tiny steps towards this in #409, but it's not ready yet.