MSBuild 15.6.82

This version of MSBuild shipped with Visual Studio 2017 version
15.6 and the .NET Core SDK 2.1.100.

Add collect referenced nuget packages target (dotnet#2764) (dotnet#2773)

Adding CollectReferencedNuGetPackages so consumers that partially import VS targets are not broken.

Add support for .NET SDK 4.7.1 (dotnet#2637)

Add final ReferenceItem item sets as an output to ResolveReferences (d…

…otnet#2542)

Version Bump (dotnet#2334)

To unblock our internal build.

Implicit facades for netstandard 1.x references (dotnet#2304)

Add target framework metadata to TargetPathWithTargetPlatformMoniker and check it in ImplicitlyExpandDesignTimeFacades

Fixes dotnet/sdk#1393

Perf improvements (dotnet#2246)

* Cache search paths directory checks in the Evaluator

* Add more lazy Traits
- fixes dotnet#2247

Revert RAR AssemblyInformation caching (dotnet#2215)

In .NET Core, it's safe to use an AssemblyInformation object without
disposing it, but that's not true in full framework because of the use
of COM objects to extract information from the assembly. Backing out the
cache until we can test a fix that correctly disposes the objects
(including for RAR failures and exceptions).

This reverts commit be56bc3.

This reverts commit 55f846e.

vbump to work around build issues

Fix build XamlBuildTask failure on 64-bit MSBuild (dotnet#2001) (dotn…

…et#2020) (dotnet#2059)

Allows 64-bit MSBuild to find XamlBuildTask.dll to build 64-bit Xaml projects.

Related to internal issue DevDiv.372915.