[REQ] Refactor to get rid of need for pasing around the target key

[cpuguy83]

What kind of request is this?

None

What is your request or suggestion?

Right now we are passing around a targetKey var everywhere which is used to get the right values for various things such as package dependencies which may either be in the root of the spec or under a target with the specified targetKey.

Instead of doing this, I think we should resolve the spec into a single struct with the right pieces merged together so that the targetKey does not need to be passed around.

Are you willing to submit PRs to contribute to this feature request?

• Yes, I am willing to implement it.