- Still support the V1/V2 split bool, but log a warning to prompt people to move to the new ClassName config entry
- Configure the V1 class in BaseEngine.ini
#jira UE-229243
#review-37638304 @Rob.Cannaday
#rb Rob.Cannaday
[CL 37654669 by Chris Varnsverry in 5.5 branch]