Fixes #41207.

Add nullable annotation to the parameter types of equality operators

Fix some typos

Delete server side liveshare handlers.

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20073.17

Remove unnecessary CS8717 suppressions.

add contents of wiki to the docs folder

When renaming a document, we ensure that the name is unique
but include the old document name in the check. Since that's
the document that's name is changing, we can ignore it
when comparing names for uniqueness.

Merge branch 'master' of ..\jmarolf\scratch\merge\roslyn.wiki\ into infra.move-roslyn-wiki-to-docs-folder

Use public APIs instead of reflection

Extract simplification helpers into their own class. 

Add Namespace grouping to API

* Update dependencies from https://github.com/dotnet/arcade build 20200122.2

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20072.2

* Update dependencies from https://github.com/dotnet/arcade build 20200122.3

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20072.3

Merge release/dev16.5-preview2 to master

Update Language Feature Status.md

Fixes #40768.

Mark Microsoft.CodeAnalysis.LanguageServer.Protocol as PrivateAssets

* Update required dotnet to 3.1.100

* Update required VS to 16.4

Minor grammar fixes in markdown file

use MIT license

LOC CHECKIN | dotnet/roslyn master | 20200116

Override definition string content to exclude hashcode for screen rea…