Make ConsoleEnvironment internal

[eerhardt]

We don't expect external users to use the ConsoleEnvironment class. It should only be used for the command line tool.

We should make this class internal so it isn't part of our public API. That way we don't need to support it as a public API forever.

See #1252 (comment)

/cc @Zruty0 @TomFinley

[Zruty0]

I agree.