Enable compilation across all platforms

[josephwoodward]

Also add Rider to git ignore.

A few tests currently fail when running on a Mac so I'll take a look at them at some point.

[codecov-io]

Codecov Report

Merging #156 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #156   +/-   ##
=======================================
  Coverage   87.19%   87.19%           
=======================================
  Files          15       15           
  Lines         406      406           
  Branches       82       82           
=======================================
  Hits          354      354           
  Misses         27       27           
  Partials       25       25

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[AnthonySteele]

Could you provide details on why it's better to include Microsoft.NETFramework.ReferenceAssemblies in the NLog.StructuredLogging.Json.csproj file, when it builds without it present; and if it's safe to ship a release using Version="1.0.0-preview.1 of this package

[slang25]

Just to comment on if a preview of ReferenceAssemblies is safe, I would say for most cases yes because the assemblies aren't in preview, the package is, so that means that you won't get weird runtime errors due to compiling against the wrong API surface, it will be either the build works or it fails due to things like filename casing, or some MSBuild problem that mean they don't resolve altogether.

It currently builds in CI as it is finding the mono reference assemblies the build script only builds for netcoreapp2.1, this change means that you don't need anything other than the .NET Core SDK to build all tfms.

[AnthonySteele]

So this is purely a build-time thing? No impact on the shipped package - I don't want to ship a release with a dependency on a -preview.1 .

[slang25]

The PrivateAssets="All" part ensures that this package does not end up becoming an external dependency for the project/package.