So we can create ViewStreams that depend on other services, config, etc.
Previously, the PrimitiveManager relied purely on static construction of types
through reflection.
Middleware handlers are invoked in the order in which they are added. Any middleware
that is added before HttpsRedirection may can prevent the request from being redirected.
As of now, only development-specific middleware is added ahead of HttpsRedircetion.
This was leftover from a misguided attempt to fix a bug that turned out
to be due to an omitted environment var:
ASPNETCORE_HOSTINGSTARTUPASSEMBLIES=Microsoft.AspNetCore.SpaProxy
John Colvin