Scripting on .NET Core 1.1

fixed 2 bugs reported on primary workspace

Push task queue to CPSProject

Updating the test projects to specifiy `shadowCopy=false` and to reference the VS test adapter package.

Update versions in post-dev15 branch to 2.1.0-beta1

Handle all expression-bodied members correctly in TryGetActiveTokens

Account for the fact that ```Not <null of Boolean?>``` is not true.

1. filter out projects that is not supported in remote host when calculating checksum
2. wrong validation on contract

unit test added

Set an appropriate title on the FindRefs window in response to new editor API changes.

Subclass the editor's BlockTag so we can pick up some heuristic changes they're making on their end.

Add Razor Language Service IVT shims

added navigate to, FAR OOP options to Roslyn Option page

Removing the last packages.config and replacing them with project.json

Instrument the body of an expression-bodied lambda for dynamic analysis

Fixes #15223.