junit-foundation-5.0.0

• Implement failed-test retry feature
• Implement dynamic RunListener attachment feature
• Clean up argument lists for method watcher interfaces
• Catch and propagate thrown exceptions in method interceptors
• Enable extension of subclasses of core JUnit classes
• Move management of ServiceLoader collections to the classes where they're actually used
• Move RunChild implementation to its own file to prevent unintended JUnit class preloading
• Enable annotation retention for enhanced classes
• Add describeChild() static utility method
• Add/update unit tests
• Add JavaDoc