Revert PRs #12725, #12726, #12786, and #12794 from `dev15-preview-4`.

made service hub works with dev15 preview 4 setup

The specified changes don't meed the bar for Preview 4 but PR #12724 does.

porting OOP to preview 4 branch

Fix a couple of official build issues

Fixes

1. Fixes warning about neutral chip in the telemetry SWIX project.
2. Only build NuGet.proj once.  Previously built from Build.proj and SetupStep2.proj

Verify SWIX builds on Jenkins

changes include
make SourceText::GetChecksum and AnalyzerTelemetry contructor public.

added MustRunInProc in IBuiltInAnalyzer and some clean up around serializing Solution/Project/DocumentId and how DocumentState is exposed.

simplified temporary storage service's temporary storage management and added ability to attach to existing temporary storage

solution checksum and serialization service.

added remote host client
- this gives an ability for host (vs) to talk to remote host (service hub)

rename and moving files between feature/workspace layers
- only real change is having ICompilerDiagnosticAnalyzer interface which can either have inproc implementation or out of proc implementation.
- inproc is needed since diagnostics are in feature layer and one who uses feature layer out side of VS host need an implementation.

added RemoteWorkspace
- RemoteWorkspace has host agnostic implementation of roslyn features/services/workspace that will run in remote host

added service hub component and setup project for service hub
- service hub component is basically thin layer that deals with converting data to pass in to RemoteWorkspace

made devdiv insertion tool to ignore servicehub related files

support byte and char array natively in ObjectReader/Writer

update list of files to copy to include recently renamed one

build interactive before it's dependencies

Merge microupdate into dev15-preview-4

remove CodeAnalysis from a package's name

The Microsoft.CodeAnalysis.VisualStudio.InteractiveWindow package isn't specific to the Microsoft.CodeAnalysis.* components.

specify packages with individual vsix versions instead of just the assembly version

Delay metadata reload

ProducesNoOutput.Settings.targets already imports it

don't ngen Microsoft.CodeAnalysis.EditorFeatures.Next.dll

The corresponding VSIX package had the same `<ShortcutPath>` as
Microsoft.CodeAnalysis.EditorFeatures.vsix which caused some problems
during setup ngen because symlinks were replaced.  The .Next.dll only
contains two assembly binding redirect attributes and doesn't need to be
ngen'ed.

1. Assert threading expectations
2. Document new variable's purpose
3. Clean up pending reloads on `Disconnect()`

Fixes #12189, and restores the behavior of the native C# language service.

The problem here is that we frequently get the file change notification
while something is still writing the file, and so we get an IOException when
we try to read it, resulting in us caching empty metadata and reporting
spurious errors.

* Don't run the IteratorRewriter on BaseMethodWrapperSymbols

* Removing git link

* Removing extra diagnostics check

* Adding execution test

Currently, if you implement an interface with a tuple type as a
substituted type argument that will be accurately represented in source,
but the names will be lost when emitted to metadata.

This PR implements roundtripping for tuples as generic type arguments to
interface implementations in metadata. This is done by adding support
for emitting attributes on interface implementations to Emit. We now
emit the same attribute on interface implementations that we would
on other areas where types may contain nested tuples. Completes the
interface implementation work referenced in #12347.

Support async methods returning Task-like types

[Based on features/async-return with tests ported from that branch.]

[Based on features/async-return with tests ported from that branch.]

Correct the version number and move version to the Targets

Add dependencies between Swixproj

The Swixproj projects encapsulating each Vsix should mention the
dependencies betweeen them similar to the dependencies stated in the
contained Vsixes.