This is the start of our unit test assembly for our MSBuild assets.

Update versions of Microsoft.DiaSymReader and Microsoft.NetFX20 packages to release 1.0.5 and1.0.3, respectively

User scenario: A CodeFixProvider that supports fix all occurrences code fix, gets FixAll support in IDE if it registers a single code action, but disappears as soon as fixer registers multiple code actions.

Reason: A CodeFixProvider that intends to support fix all occurrences must classify the registered code actions into equivalence classes by assigning it an explicit, non-null equivalence key which is unique across all registered code actions by this fixer. This enables the FixAllProvider to fix all diagnostics in the required scope by applying code actions from this fixer that are in the equivalence class of the trigger code action.
The analyzer added by this change catches violations of this requirement in the code actions registered by a CodeFixProvider that supports FixAllProvider.

Fixes #2864

Upgrades System.Collections.Immutable to 1.1.34-rc and
System.Reflection.Metadata to 1.0.19-rc.

This reverts commit b37052d0.

This changes our projects to consume xUnit through NuGet instead of our checked in binaries in Closed\Tools\xUnit.  This is another step in removing project scrubber.  (changeset 1396548)

This changeset introduces the concept of a "global" nuget package. The references to the NuGet packages are inserted into the Open VSL.Settings.targets file, which is imported into every project in Roslyn. This ensures that every project automatically gets these "global" packages. (changeset 1386548)

Updates System.Collections.Immutable and System.Metadata.Reader to versions 1.1.33-beta and 1.0.18-beta, respectively.
     Updates VSMEF to the latest build from VSPRO_1.

     A few code fixes:
     - ImmutableArrayInterop is gone
       - in product we used in a couple of places where we now just create a copy of the byte[] (MetadataWriter)
       - test infrastructure uses a workaround with explicitly laid out union to avoid copies of large metadata blobs
     - EditorTestApp class was incorrectly importing MEF components resulting in a cycle. The new VSMEF reports such errors. (changeset 1385613)

     1. Removes the shared state and locks in favor of a more event driven style model.  Values which were previously represented as writes to shared state are now represented as Task<T> values.  The server will create the necessary Task values for the given state of the server, wait on any of them to complete and then handle them in a defined order.  This eliminates a couple of remaining race condition in the server.

     2. In the case of a client disconnect the server will initiate a soft shutdown.  It will accept no new connections but wait for the remaining connections to complete processing before terminating the process.

     There is no fear of state corruption here.  The goal is parity with the native command line compiler.  If the user kicked off an expensive compilation they could terminate it with Ctrl+C and free up machine resources (or simply stop the compiler from repeatedly page faulting the machine).  Roslyn needs to mimic this behavior as best as possible with VBCSCompiler.

     To be clear: this allows the server to complete while the compiler is still compiling code.  It will only do so for connections which were severed by the client disconnecting from the named pipe.

     3. In the case of an exception serving the compilation task the server will log the error and terminate itself immediately via Environment.Exit.  Such an exception represents a flaw in the compiler itself and we can make no guarantees about the state of shared data in the compiler.  Hence we terminate all existing task

 (changeset 1383458)

We had a number of projects that included the StyleCop NuGet package only to also disable StyleCop. We also had some projects that were referencing assemblies out of packages but didn't say so in packages.config, or had stuff in packages.config not reflected in the actual project file. (changeset 1378738)

***NO_CI***
 (changeset 1367677)

***NO_CI***
 (changeset 1356181)

This also updates Microsoft.Net.ToolsetCompiler to the corresponding version. (changeset 1355122)

When our projects were last updated to a newer version of Microsoft.Net.ToolsetCompilers, NuGet didn't replace the old version--it just put the new version next to it. Every project ended up referencing both versions, and which set of compiler binaries "won" depended on the order they appeared in the project file. So different projects built with different compilers.

This change strips out all references to the old version. (changeset 1352054)

***NO_CI***
 (changeset 1341082)

Change projects to reference the Proprietary Resources NuGet package versus the project. (changeset 1331358)

Update the version of the toolset compilers used for build and make sure that all projects are using the toolset NuGet. (changeset 1330804)

Adds support for method body visualization to MetadataVisualizer. (changeset 1236565)

Update Test Resources Nuget package to Microsoft.CodeAnalysis.Test.Resources.Proprietary.0.7.4032713-beta

Not strictly necessary, but it would be nice to be on the same build as the toolset compiler. (changeset 1217394)

The new package is Microsoft.Net.ToolsetCompilers.0.7.4032713-beta.nupkg. (changeset 1217346)

Update Test Resources Nuget package to Microsoft.CodeAnalysis.Test.Resources.Proprietary.0.7.4032705-beta (changeset 1216765)

Update the VBCSCompiler test name to Roslyn.Compilers.CompilerServer.UnitTests to cause it to be run by Test.exe. (changeset 1215118)

Update System.Collections.Immutable 1.1.18 -> 1.1.20
Update System.Reflection.Metadata 1.0.8 -> 1.0.9 (changeset 1211547)

Removing duplicate entries from repositories.config (changeset 1211406)

Update System.Reflection.Metadata 1.0.8 -> 1.0.9 (changeset 1211431)