[WIP] Add license expression and icon to template spec

[cartermp]

My attempt at #3710, but minus the deprecation parts

[forki]

what's the status?

[cartermp]

I need to figure out how to actually pack files with paket.template. Can't seem to figure it out :/

[CaptnCodr]

Can we go on here? These nuget deprecation hints are annoying.

[baronfel]

@CaptnCodr you can also put the license expression in your project file and pack with dotnet pack these days, you don't need to use paket.template.

[CaptnCodr]

@baronfel How about the deprecated "iconUrl"?

[baronfel]

@CaptnCodr https://docs.microsoft.com/en-us/dotnet/core/tools/csproj#packageicon this help doc describes what properties you'd use to set an image, along with a number of others. note that nuget now wants you to embed the icon instead of pointing to an external resource.

[cartermp]

This one should be easy enough, I just kind of gave up on some of the integration tests largely because...I couldn't write a proper paket.template file :/

[CaptnCodr]

Yes, I see. But we only use the paket.template to generate our nuget packages.
But why isn't it implemented like "license" which is the reaction of the deprecation of "licenseUrl" so how about to go on here and you have one PR from the list and an issue from the other? 😄

[cartermp]

I think we'd all be happy to take a PR that only does each one at a time.

[cartermp]

license is also added as per here: #3824

[CaptnCodr]

Ah yes.