Add licenseListVersion back to CreationInfo

[goneall]

This fixes #131

[zvr]

I have some reservations about adding this to CreationInfo for every Element (although it will not be mandatory). We had some discussions on dataLicense on that.

We really want it for things that have licenses -- or, more precisely, not even for licensed things but for the license expressions themselves. So why don't we make it a property of these?

[goneall]

I have some reservations about adding this to CreationInfo for every Element (although it will not be mandatory). We had some discussions on dataLicen

In anticipation of this - I've already prepared an alternative proposal to add it to just the license expression in SimpleLicensingInfo.

I'll create a pull request for review.

[goneall]

Change to draft status until we decide which PR to merge.

[goneall]

Closing this PR as #481 is the preferred solution to the license list version.