- Create our own JNI wrapper on top of latest play-services-games-v2 classes
- Adapt OSSGooglePlay to use this wrapper
- Remove deprecated/unsupported functionality
- Fix some issues with JNI support
#jira UE-201481
[REVIEW] [at]Michael.Kirzinger, [at]Chris.Babcock, [at]Bertrand.Carre
#rb Chris.Babcock, Michael.Kirzinger, Sam.Zamani
[CL 30963393 by rafa lecina in ue5-main branch]