refactor: change TeardownFeature to work cross-app domain and isolated from ObjectDisposalFeature
red: add TeardownFeature to V2
green: add TeardownFeature to V2
refactor: remove redundant teardown handling from CurrentScenario
red: fixed BackgroundFeature
green: fixed BackgroundFeature implementation in V2
Merge pull request #191 from adamralph/51

51 add teardown feature and fix background feature in v2