Issue #3395056 by ELC: Revert 8.x-1.x branch to D8 compatible
Removed the core key, resulting in a minimum version of 8.8 being required. Revert event handling back to D8 classes and parameter ordering.
Removed the core key, resulting in a minimum version of 8.8 being required. Revert event handling back to D8 classes and parameter ordering.