Allow global params in Nulecule spec.

[rtnpro]

Adds support for global params in Nulecule spec to support projectatomic/atomicapp#378

[aweiteka]

It's significant to add another top-level element but I understand the rationale. Referencing the existing params object is nice and clean.

For background discussion see projectatomic/atomicapp#378, specifically projectatomic/atomicapp#378 (comment)

LGTM

[cdrage]

I agree with @rtnpro the rational for global params brings a much cleaner slate to Nulecule.

We can have both. Having global params certainly helps bring minimalism to the table.

This LGTM. Let's get this in! 👍

[goern]

I'm offline today and will revisited it tomorrow

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[dustymabe]

LGTM, let's get this in unless we get feedback from christoph that points otherwise.