* Chain coherent dependencies up through Extensions to EF Core packages
- should reduce incoherent PRs we get from `darc`
- react to AspNetCore-Tooling breaking changes
- use C# Preview version in Blazor integration tests
- update `EnsureOptions_ConfiguresDefaultParseOptions` test to match new C# version default
- react to new newline encoding behavior; thanx @ajaybhargavb!
- update product code and tests to use new GetItem API; thanx @NTaylorMullen!
- RazorProjectFileSystem breaking change
- update ref assemblies
- react to EF Core breaking changes
- react to EF Core method rename
- react to aspnet/EntityFrameworkCore@ccfc5edbc7
- react to aspnet/EntityFrameworkCore@6cb41531df breaking change
- disable new analyzer in `ScratchDatabaseFixture`
- skip `MvcTemplate_NoAuthImplAsync(...)` test for F#
- #8996
- exclude some runtime assemblies from crossgen; thanx @BrennanConroy!
- add direct references to Mvc in AzureAD samples
- unclear why the reference is no longer pulled in transitively
* Run `darc` to grab the latest
- CoreFx packages with version 4.6.0-preview4.19204.1 to ensure coherency
- core-setup packages with version 3.0.0-preview4-27604-05 to ensure coherency
- Extensions packages with verisn 3.0.0-preview4.19204.2 to ensure coherency
- EntityFrameworkCore packages with version 3.0.0-preview4.19204.7 from build 20190404.7
- AspNetCore-Tooling packages with version 3.0.0-preview4.19204.2 from build 20190404.2
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