Support targeting .net standard

[sneal]

I'm not sure what's possible in this realm because of the lighter weight reflection API, but it seems like some support would be possible.

[drewburlingame]

Hey Sneal. Are you using this? I had assumed everyone had moved on to using Json serializers. In my current projects, I only use a version of the AddContext extension method to ensure the added item is serializable and then let the whole object graph serialize to json.
I'm a bit swamped at the moment. I may have some time later in the year to convert to using json. Once using the json serializers, supporting .net standard would be trivial.

[devinterx]

@drewburlingame Warning:

Server.csproj: [NU1701] Package 'ObjectPrinter 2.0.35' was restored using
.NETFramework,Version=v4.6.1' instead of the project target framework '.NETCoreApp,Version=v2.2'. This package may not be fully compatible with your project.