I didn't make whole language service to not start since I wasn't sure end result of
such big change. that probably should be done by IDE team.

Long changes

Updating Roslyn to use the Managed Query API for locating a valid Dev15 install.

Test Tuples and SymbolDisplay.ToMinimalDisplayParts

Adding a hack to workaround some new `VsDevCmd.bat` behavior related to it changing the current directory.

Use NuGet 3.6.0-beta1 which has support for -msbuildpath to find MSBuild

* fail when nuget fails

* update benchview tools location

* use a tools directory

* make tools directory if it doesn't exist

* consolodate path changes

Add another IVT for CodeLens

Convert more tests that use single line strings for code.

Add a new code action to find cases where an expression could be updated to use a collection initializer.

Only hook up P2P refs to C# or VB projects in DPL.

Add feature that offers to convert from a conditional expression to ?.  

Update the loc string displayed to the user for 'Qualify Member Access'.

Fixes #10226

It turns out that the ProjectTracker might know about Xaml projects
that have the same project file path as a C# or VB project.

Fixes internal issue 282125.

Transform tuple local types in EE regardless of names

Move to the new props / targets names

Fixing the cibuild.cmd script to no longer explicitly require MSBuild 14.0

Add parsing tests for a line-If inside a single line Function lambda.

Add feature to convert concatenated strings to interpolated strings.