Fix type catalog generation - #734

Paul Allen (@paulcallen) I did this review using Reviewable in Edge. While I had to "always allow" pop-ups to let GitHub authenticate initially, it worked just fine. Edge itself got a little slow, but that's to be expected (Edge has known performance issues).

Review status: 0 of 7 files reviewed at latest revision, 8 unresolved discussions.

src/Microsoft.PowerShell.CoreCLR.AssemblyLoadContext/CorePsTypeCatalog.cs, line 0 [r1] (raw file):
This is an auto-generated file.

src/Microsoft.PowerShell.CoreCLR.Eventing/project.json, line 25 [r1] (raw file):
These are unrelated to this PR but were necessary to quiet NuGet warnings because a prior PR was merged out-of-date.

src/TypeCatalogGen/build.sh, line 2 [r1] (raw file):
I tried to remove this remaining Mono dependency by building the generator for .NET Core. While I could get it to build successfully, it had a strange issue starting.

src/TypeCatalogGen/build.sh, line 10 [r1] (raw file):
This is hard-coded because it is the output file that the ALC expects, and the input file the generator expects.

src/TypeCatalogParser/Main.cs, line 17 [r1] (raw file):
This is hard-coded because it's what the type catalog generator is expecting.

src/TypeCatalogParser/Main.cs, line 20 [r1] (raw file):
This is hard coded because Linux.Host is our top level project, and this must be done only for the .NET Core framework.

src/TypeCatalogParser/project.json, line 1 [r1] (raw file):
I should probably add metadata here.

test/powershell/DotNetInterop.Tests.ps1, line 3 [r1] (raw file):
We should probably add more tests here eventually. I added this one in particular because it was the regression that I hit.

Comments from the review on Reviewable.io

Reviewed 7 of 7 files at r1.
Review status: all files reviewed at latest revision, 8 unresolved discussions.

Comments from the review on Reviewable.io

Thanks, merging.

Review status: all files reviewed at latest revision, 1 unresolved discussion.

Comments from the review on Reviewable.io

Reviewed 1 of 7 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

Comments from the review on Reviewable.io