HttpRepl doesn't respect servers:url as a base automatically #148

I've got a simple node app with a swagger.json like this.
swagger.txt

{ "openapi": "3.0.0", "servers": [ { "url": "/api/v1" } ]...

And while it is correct and valid swagger, it's not automatically usable with httpRepl without manual and non-intuitive base url setting.

set base https://MYSITE/api/v1 set swagger https://MYSITE/swagger.json

The base setting should be implied by the single servers:url and this should work without manual set base or manual set swagger.

Second ask - Would be nice to "Set swagger LOCALFILE" as well. Or even "dotnet watch httprep --swagger LOCALFILE" for iterative development.

cc @tlmii