* Update dependencies from https://github.com/dotnet/arcade build 20190924.3
* Update dependencies from https://github.com/aspnet/Blazor build 20191003.2
* Update dependencies from https://github.com/aspnet/AspNetCore-Tooling build 20191007.2
* Update dependencies from https://github.com/aspnet/EntityFrameworkCore build 20191010.4
* Remove potentially unnecessary feeds
* Install the runtime during source build
* Pin m.nc.app.ref
* Add aspnetcore-dev feed back to nuget.config
* Pin internal refs package
* Move efcore internal refs dependency
* Compile against ref assemblies
* Add manually generated internal ref assembly:
* DataProtection
* Kestrel
* Hosting
* Http
* Mvc
* Middleware
* SignalR
* Identity
* Components
* Fix crossgen for ref compilation
* Fix tools for ref compilation
* Explicitly specify ExcludeFromSourceBuild
* Build targeting pack for 3.0.1
* Improve condition for building targeting pack in 3.0.1
* Fixing siteex build for ref compilation
* Resolve reference assemblies from Extensions
* Don't build refPack during source build
* Add big list of project references, for tests to use
* Exclude sources files from indirect references
* The types in these packages will be compiled into the binaries of the projects that directly depended o it
* Add manual indirect references to project references
* Add samples/test assets
* Don't add indirect refs for ProjectRefs with ReferenceOutputAssembly=false
* Fix JSInterop for ref compilation
* Do not substitute ext ref assemblies in ref pack
* Disable the TestFramework assembly attribute from Logging.Testing
There's custom logic in ProjectTemplates.Tests to use a different TestFramework instead
* Fix Functional tests
* Issues caused by incorrect deps files working around this via test infrastructure instead
* Mvc
* Analyzers
* StaticFiles
* SignalR
* HttpOverrides
- `'$(IsTargetingPackBuilding)' == 'false'` should only disable the targeting packs on non-Windows
- disable `CreateTargetingPackNugetPackage` target on Windows
* Pin Microsoft.Internal.Extensions.Refs
This is not being produced in current 3.0 builds so the coherent parent dependency attribute cannot be satisfied.
- work around dotnet/core-eng#7970
- install Git in repo if Tar can't be found in usual locations
- use found or installed Tar in Microsoft.AspNetCore.App.Ref project
- copy into repo from wherever it's found
- add lots of `Write-Host` debugging
nit: clean up / comment on VS Code warnings about build.ps1