2.9.1-preview.3

Preview release with migrated Allure.XUnit, Steps and fixtures (Before, After) attributes and async steps support.

Allure.XUnit:

• AllureStep attribute reworked
• AllureBefore attribute should work as expected
• AllureAfter attribute should work as expected
• Steps methods should be reworked either deprecated soon (Let's discuss!)
• AllureAttachments marked as Obsolete - use Attachments instead

Allure.Net.Commons:

• Attachments uploads in background threads