Consolidate csproj and nuspec

[jnyrup]

Incorporating the .nuspec into the .csproj has some nice benefits.
One of the major sale points is that declared dependencies are always in sync.
Currently the Newtonsoft.Json dependency and release notes are out of sync.

GeoJSON.Net/GeoJSON.Net.nuspec

Line 16 in 335e9d7

<dependency id="Newtonsoft.Json" version="10.0.1" />

GeoJSON.Net/src/GeoJSON.Net/GeoJSON.Net.csproj

Line 18 in 335e9d7

<PackageReference Include="Newtonsoft.Json" Version="10.0.2" />

GeoJSON.Net/GeoJSON.Net.nuspec

Line 12 in 335e9d7

<releaseNotes>Fully RFC 7946 compliant. Deprecating GeographicPosition in favour of Position to match RFC</releaseNotes>

GeoJSON.Net/src/GeoJSON.Net/GeoJSON.Net.csproj

Line 14 in 335e9d7

<PackageReleaseNotes>Assembly is now strong named</PackageReleaseNotes>

For examples on the conversion:

• Replace nuspec with csproj fluentassertions/fluentassertions#1009
• Replace nuspec and AssemblyInfo with csproj sendgrid/sendgrid-csharp#892

Let me know if you'd like any help.

[xfischer]

Hi @jnyrup ! Sounds really great. Could you put that in a PR that would be nice.
@matt-lethargic are you OK with this ?

[jnyrup]

Should I target this against the master or 2 branch?
(or both?)

[matt-lethargic]

master I think we can basically call this feature complete and 2 hasn't really materialised! I'm happy with you creating a PR for this. I don't use nuspec files these days.