This allows it to be easily re-used in other libraries to do
meta-testing on their own godog features/steps.
At some point it may make sense to migrate this entirely to a
sub-package of godog, however that would require a larger
re-architecting of the project structure to avoid circular dependencies
(e.g. `import cycle not allowed`).
* bdde4c4 fix test suite and migration changes
* a3b6e01 refactor pretty formatter
* 2c0c7ba fix outline scenario handling
* f6b411d add a different language test feature
add a different language test feature
* 042235c expose StepDef which is needed to formatters
* e9474dc fix outline scenario formatting
* f02c6ce fix comment position calculation for outlines
* 5d7f128 remove step status type, use standard error
