Exit on assert failure in bootstrap build

This changes the compilers and server to exit the process when a Debug.Assert
call fails in a bootstrap build.  The current behavior of throwing up a dialog
blocks the Jenkins build until a timeout occurs and leaves no data.  Now a full
stack trace will be printed, the process exits with a non-zero exit code and the
entire run will fail promptly.

Port fix for flaky test TestAnalyzerLoading from future to master

Support removal namespace in interactive mode

Keep property on a single line if the getter was on a single line.
Fixes #5335

Add support for public sign to csc

[Master] Update NuGet zip to the latest

Make code more resilient to potential bad situations.

Mark the compiler extension as shipping

Allow the 'replace method with property' refactoring to work with get/set methods, not just Get/Set methods.

Fixes #6718

This includes the CPS SDK so that C#/VB CPS implementation can be merged into future.

Remove unnecessary overload.
Fixes #6640

We use the shipping flag to control VSIX signing, and we want this to
be signed.

Fixes GitHub issue #6803.

Don't add nested code actions *and* their parent to the smart tag list.

The test is failing intermittently with an InvalidCastException 'Unable to cast transparent proxy to type 'Microsoft.CodeAnalysis.UnitTests.RemoteAnalyzerFileReferenceTest' over [here](http://source.roslyn.io/#Roslyn.Compilers.UnitTests/AnalyzerFileReferenceTests.cs,197). This test creates a separate appdomain, invokes CreateInstanceAndUnwrap on it and then casts the created object to type RemoteAnalyzerFileReferenceTest defined in the same assembly. This indicates that the CLR ended up loading a separate instance of the assembly from a different path in the appdomain, causing the cast failure.

Fix is to use the [AppDomainUtils.Create](http://source.roslyn.io/Roslyn.Test.Utilities.Desktop/R/32b4516c21702320.html) method for creating the appdomain. This helper method has a special assembly resolve handler hooked up to the created appdomain that first attempts to resolve the assembly from current xunit directory. This helper is already being used by a similar remote analyzer loading test [TestAnalyzerLoading_Error](http://source.roslyn.io/#Roslyn.Compilers.UnitTests/AnalyzerFileReferenceTests.cs,b04fd584904390af).

Fixes #6665

Allow the 'replace method with property' refactoring to work with get/set methods, not just Get/Set methods.

Add a couple of tests and remove unused EE source file

Adds a bit vector to explicitly distinguish between edited and unedited statements.
This allows to keep the existing assertions in place.

Fixes issue #4230 where removal of top-level statements would crash VS due to
the fact that these statements report empty diagnostic spans.

Syntax analysis now handles this edge case.

Fix hard-coded error message in DynamicView tests...

Always "fail fast" in EE unit tests...

Clean up complexity around OfficialBuild flag that is breaking official builds