this is to make develop - debug cycle easiler when adding new features to service hub.

to enable this, turn on Roslyn/FeatureManager/Features/RemoteHost and RemoteHostInProc

once enabled, InProcRemoteHostClient will be used instead of ServiceHubRemoteHostClient

except concrete type of RemoteHostClient, all other parts, exactly same code will be used.

InProcRemoteHostClient can be used in unit test to test client and server side as they are.

this makes sending over roslyn-internal solution data to OOP from 3 minutes to 4 seconds.

after that, only changed assets are sent over which is usually less than 1-2ms.

this optimization is only for actually moving data between 2 processes. there are other things involved which need to be optimized as well to make whole system to be faster than right now (which takes about 1+ mins for initial solution load)

The ImportGroup element is just noise.  It was also used very inconsistently in the repo and often within the same project file.  Just remove it.

This reverts commit 720f5c5e, reversing
changes made to 6a6043c3.

added abstraction in remote host and diagnostic service to prevent VS.Next dll from loading if remote host option is off.

the abstraction I added here is specific to diagnostic service feature. that abstract solely exist to prevent VS.Next dll from loading if remote host option is off.

this is different than IHostSpecificService abstraction I used to have that is generalized form of this abstraction which automatically figure out what to load based on option and layering/MEF composition of roslyn.

in this model, each feature need to take care of this kind of issue.

The dependency projects serve a few purposes:

- Help ensure package unity by serving as a single place for a NuGet reference.
- Make NuGet updates simple by having a single place to change.
- Grouping together related packages to make it easy to take a dependency on say Visual Studio editor.

The first two points are largely obsolete now that our project.json references are strictly validated on every build and have a single update mechanism.  This meant a lot of our depnedency projects were just making Roslyn.sln bigger.

As such I went through and deleted all of them which had only 1 or 2 project.json entries.  I left the VS ones which tend to group 10+ references together.  They are still serving a valid "reference VS" purpose.

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

Instead using a facade/mixin approach to more cleanly pull this off.

More cleanup to do between RoslynCompletionSet and
FilteredRoslynCompletionSet.