We wrap every data to one of the `Node` object. But, since we were
passing `self.data` instead of `self`, it was skipping the conversion
and instead was just trying to set data as-is, which would have make
our latter assumptions incorrect, as other codebases assume it to be
a `Node`.
I have added asserts in a few places. Also, I noticed that, on a few
test assumptions, when `resolving`, we were not converting values
back to it's original form (`CtxDict` -> `dict`, `CtxList` -> `list`
and `Value` -> _). So, I have added `node.value` property, as it is
a complement of the above fix.
This caused a ripple effect for the changes in the API as `foreach`
now resolved and changed the data to the original form,
which prevents us from tracking the data later in the "field".
So, `resolve`/`select` got a real `unwrap` option that should
reliably work for all kinds of `Node` objects.
* Add test, and fix resolving of paths for params
Improve merging of vars and imported params, improve tracking
Resolve wdir correctly
* Fix windows relpath
* isort imports
Saugat Pachhai