Delete Paket and FAKE

[Smaug123]

This is now ready for review (as of e20ce41). There are some known quirks, which I'm listing in #663 ; this PR is massive, so I propose fixing them in follow-up PRs instead.

Nupkg dependencies are the same

dotnet fsi build.fsx -t NugetPack and then create NuGet.config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <add key="LocalSource" value="/Users/patrick/Documents/GitHub/FsCheck/bin" />
  </packageSources>
</configuration>

Verify deps in Rider:

• FsCheck
• FsCheck.Xunit (new dependency on FSharp.Core >= 5.0.2 and I have no idea where it came from, but that would have been inherited from FsCheck anyway so I'm not too bothered about it)
• FsCheck.NUnit

Tested on macOS

• RunTests
• Clean
• CI
• Build
• Tests
• Release - tested up to the point of performing the git push; GitHub release logic completely untested
• Docs
• WatchDocs
• ReleaseDocs - tested up to the point of failing to git push due to my own restricted perms
• NugetPack
• NugetPush - tested to within the limits of my ability to publish to NuGet
• BuildVersion - I don't know what this is here for but I do the same as what it used to do
• AssemblyInfo

Tested on Windows

• RunTests
• Clean
• CI
• Build
• Tests
• Release
• Docs
• WatchDocs
• ReleaseDocs
• NugetPack
• NugetPush - tested to within the limits of my ability to publish to NuGet
• BuildVersion - I don't know what this is here for but I do the same as what it used to do
• AssemblyInfo

[Smaug123]

@kurtschelfthout I don't have perms to kill the existing runs, which are just spinning due to me falling victim to one of the classic .NET blunders (failing to call Process.BeginOutputReadLine). They're going to hang forever.

[Smaug123]

Dear Lord I hate msbuild and NuGet. They're both so completely cursed.

[Smaug123]

@kurtschelfthout Have at it; feel free to give it a go on a branch for releasing the docs!

[Smaug123]

(Feel free to tell me to do anything better, by the way. After hours of fighting NuGet and the dotnet CLI, I stopped when I reached something that appeared to work; but tomorrow is a new day.)

[kurtschelfthout]

This is awesome. I had to fix a few things when releasing the docs, but that's fine. I managed to release the docs which is great.

I'm going to test the nuget pack tomorrow, it's getting late here.

[kurtschelfthout]

Pack looking great. I'm going to merge this, fix up on master what I've fixed up. Then I'll try an actual release of rc2, which will need a few additional fixes.

This is awesome. Much appreciated.

[Smaug123]

Cool - tag me if you need a hand with anything, I should be around for most of today.