In SwiftForth /interperter seems to initialize something needed
to stop it from resetting the terminal personality.
backend/swiftforth.fth (repl): Use a custom REPL. Let's see how that works.
(accept-no-echo): New.
(winning-personality): Overwrite ACCEPT. Even though echoing is part
of the spec, it makes little sense in a comint buffer.
In SwiftForth /interperter seems to initialize something needed to stop it from resetting the terminal personality.