cucumber / cucumber-jvm / 4011

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[Core] Default to --strict mode (#1960)

Unlike other implementations Cucumber-JVM defaults to `--non-strict` mode. By defaulting to `--strict` Cucumber follows the same standards as other implementations.

Additionally the option to set strict mode adds complexity for consumers of Cucumbers output. They have to interpret Cucumbers 6 scenario outcomes with this in mind. By removing `--strict/--non-strict` mode we remove this complexity all together.

With PR Cucumber will:
 * default to `--strict` 
 * throw an error on `--non-strict`.  
 * warn when `--strict` is used.
 * only print snippets as part of the exception thrown by JUnit rather then use the summary printer
 * only print snippets as part of the exception thrown by TestNG rather then use  the summary printer

Partial fix for #1788, https://github.com/cucumber/cucumber/issues/714

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