Re-write formatters against new API

[mattwynne]

For 3.0 the https://github.com/cucumber/cucumber/blob/master/lib/cucumber/formatter/legacy_api/adapter.rb should be removed, and all formatters that ship with Cucumber should go through the new, test-case based API.

Altogether there are:

• progress (Rewrite the Progress, Usage, Stepdefs formatters to the new formatter api #859)
• pretty (Let the Pretty Formatter use events #1305)
• html (Remove the HTML Formatter #1306)
• json (Rewrite the Json Formatter to use the new formatter api  #851)
• json_pretty (is the same as json)
• junit (Rewrite the JUnit Formatter to the new formatter Api #855)
• stepdefs (Rewrite the Progress, Usage, Stepdefs formatters to the new formatter api #859)
• usage (Rewrite the Progress, Usage, Stepdefs formatters to the new formatter api #859)
• debug can be removed - only for help writing old-API formatters
• rerun done in (83a0c75)

I think the progress formatter is the place to start, as there's a lot of shared code in all the console formatters. If you want to tackle one, please create a ticket and reference this ticket.

[mattwynne]

Pretty re-write investment may be best placed into https://github.com/cucumber/cucumber-pretty-formatter

[mattwynne]

Charlie Rudolph has just dropped the pretty formatter from cucumber-js altogether, and just just pretty-printing failures.

As much fun as it is writing pretty formatters, I think we should give serious consideration to doing the same, and giving ourselves a clean slate for these.

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[mattwynne]

💖 🌈 hooray!

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