Unify features with cucumber-features

[jbpros]

cucumber-features + Aruba is now the official way of testing cucumber.js. This is great. But it would even be nicer to have cucumber.js test itself again, like in its early days. Remember: it emerged by testing itself :)

To achieve this we need:

• JS step definitions for cucumber-features (this is easy, those already exist within cucumber_js_mappings.rb)
• create the JS mappings between those step definitions and the features ("step definitions of step definitions")
• remove redundant features from cucumber-js/features (e.g. progress_formatter.feature); we should keep the number of implementation-dependent features to a minimum, imho.
• remove old JS step definitions

Of course, running cucumber-features with cucumber.js won't generate the nice documentation we get from Aruba.

Also, the step definitions won't run the cucumber.js CLI but will directly load a Cucumber.js instance in-memory. At least for now.

[lock]

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