Remove old comment
Fix a couple of scenarios for WIP

Needs cucumber/cucumber-ruby-core:0a169070deba976e5f9e6f45ea95abc15bb53db5
Pass location to multiline string
Remove old USE_LEGACY stuff
Fix `#puts` from step definitions.

Ensure that all messages get sent to Formatters.

`Struct`s have `#puts` from `Object` so it's not caught by
`#method_missing`. Inheriting from `BasicObject` gives
`FormatterWrapper` smaller interface.