Add regression test .NET class interop

This bug arose because of a shortcut previously taken when generating
input for the type catalog generator. With a proper parser created, the
input to the generator is now correct, and so this test should succeed.

test/powershell/DotNetInterop.Tests.ps1

@@ -0,0 +1,5 @@
+Describe ".NET class interoperability" {
+    It "Should access types in System.Console" {
+        [System.Console]::TreatControlCAsInput | Should Be $false
+    }
+}