Added deconstruction support, tests for IFieldReferenceExpression in out var and deconstruction script scenarios.

* dotnet/features/ioperation: (109 commits)
  Update ServiceHubRemoteHostClient.cs
  Block on remoting over all the state changes.
  Rename parameter.
  Add comment.
  Simplify RPC.
  Use a connection instead of a keepalivesession.
  Use out variables.
  Use explicit tuple name.
  Use pattern switch
  Use pattern switch
  Use pattern switch
  Use pattern switch
  Use pattern switch
  Use pattern switch
  Use pattern switch
  Use pattern switch
  Use pattern switch
  Use pattern switch
  Use pattern switch
  Use pattern switch
  ...

Merge master to features/ioperation

Pause OOP server when 'global operations' (i.e. build) are executing.

Use pattern switches.

Use out-variables.

Use pattern matching.

Merge master to features/ioperation

Use explicit tuple name.

Be resilient to the document being shorter than when it started when getting completion description

Use local functions instead of explicitly allocated delegates.