Move Options and CodeStyle APIs to shared layer

Fix shared project file reference

Improve performance of analyzer driver in presence of symbol start an…

Do not crash in IsUnsafe helper.

Fix genarate-equals failing in partial types.

Revert "Use globs in .projitems (#42517)"

* Add WhereAsArray with generic argument.

* Feedback

Support generate-method on nullable structs.

Simplify code for figuring out the name for a symbol in a feature.

Always keep foreach-variable when converting to for-loop

Use FailFast with diagnostics

Fix enum preselection in VB collection initializer

Change all the direct uses of `Environment.FailFast` to instead use
`FailFast.Fail`. The latter has diagnostics which are useful for determining why
unit tests are failing.

This change ensures that shared projects will contain all source files
that would be included by a globbing approach, allowing for a simple
future transition to globbing once supported by the project system.

This reverts commit 423c52f2.

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20171.1
Co-authored-by: Ndotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

Port C# RemoveUnreachable code analyzer/fixer to shared layer

* Use globs in .projitems

* Revert EE changes

* Use DefaultLanguageSourceExtension

Port C# UseDefaultLiteral analyzer/fixer/tests to shared layer

* Update dependencies from https://github.com/dotnet/arcade build 20200318.1

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20168.1

* Update dependencies from https://github.com/dotnet/arcade build 20200318.2

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20168.2

* Update dependencies from https://github.com/dotnet/arcade build 20200320.1

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20170.1

* Update dependencies from https://github.com/dotnet/arcade build 20200320.4

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20170.4
Co-authored-by: Ndotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

Revert "Merge pull request #42622 from gafter/records3-merge-2020-03-20"