Add NuGet aware project support in ProjectManager. Also fixed the dea…

…dlock during rollback because of Wait(). Replaced it with await.

Filter out -utf8 from args

Fix nuget.exe update -self

Fixes #3814 so that nuget.exe update -self can detect the correct version. Unfortunately means 2.7.3 of the command-line.

Turned out Jeff's fix didn't work on build machine: When you're building
on the local machine, the BUILD_NUMBER is normally empty. In this case,
the version nubmers specified in Common\CommonAssemblyInfo.cs take
effect.

However, on teamcity build machine, BUILD_NUMBER is set. Those
RegexTransform will be executed. In this case, the $(PackageVersion)
specified in this file takes effect.

Add Support for non-PCL Mono projects

2.7.1 release

2.7.1 release