Reduce netstandard version to 1.1

[sblom]

NOTE: I don't know if this is a good idea or not--I just wanted to kick off the conversation.

I was just experimenting with how low I could get our .NET Standard version.

There are two commits:

1. The first one lowers our minimum target platform to netstandard1.1, and
2. The second one enables a bunch of previously conditionally compiled code everywhere, since it now seems to be universally supported by all of our platform targets.

The first one doesn't appear to have any downsides. The second is probably safe as well. It loses ICloneable on Context, but it looks like it was disabled in all of our builds anyway.

Analysis
It turns out that all tests pass with zero changes all the way down to netstandard1.1. Unfortunately, netstandard1.0, is missing HttpClient. Given that netstandard1.0 picks up ZERO additional compatible framework versions, this doesn't seem like a worthwhile tradeoff.

netstandard1.1 covers us all the way down to .NET Core 1.0 & .NET Framework 4.5. Best practices recommend targeting netstandard2.0 as well so that for modern frameworks one doesn't have to restore hundreds of no-op netstandard NuGet packages.

@asbjornu, you added netcoreapp2.1, a couple of years ago. What does that buy us on top of netstandard1.1;netstandard2.0?

[asbjornu]

@asbjornu, you added netcoreapp2.1, a couple of years ago. What does that buy us on top of netstandard1.1;netstandard2.0?

I did that as a part of #38, which was about getting the build to pass on Travis. I can't remember exactly why netcoreapp2.1 was added, but if everything works without it and with the target lowered from netstandard1.3 to netstanndard1.1, I say go for it!

[goofballLogic]

yes agreed. I'd like to see legacy frameworks supported when we can too. I think it's very achievable for this library.

[asbjornu]

I suppose this is a backwards compatible change so we can release it as a part of the next 1.1 release?

[codecov]

Codecov Report

Merging #82 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   68.72%   68.74%   +0.02%     
==========================================
  Files          23       23              
  Lines        4067     4067              
  Branches     1033     1033              
==========================================
+ Hits         2795     2796       +1     
+ Misses       1128     1127       -1     
  Partials      144      144              

Impacted Files	Coverage Δ
src/json-ld.net/Core/Context.cs	89.56% <ø> (ø)
src/json-ld.net/Core/JsonLdApi.cs	84.85% <ø> (ø)
src/json-ld.net/Core/JsonLdProcessor.cs	68.68% <ø> (ø)
src/json-ld.net/Core/NormalizeUtils.cs	95.47% <ø> (ø)
src/json-ld.net/Util/JavaCompat.cs	70.00% <ø> (+0.83%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update db11318...6add465. Read the comment docs.

[sblom]

Alright. With that last commit bringing in net40 support, we now have support for every framework and PCL profile that this project has ever supported since birth.

[asbjornu]

Awesome!