1. add SceneBinary to 2.x
1.  add classname = "" log.
1.  remove Hungary style.
1.  remove hungary style.
2.  fixes build error.
1.  NULL->nullptr.
2. bRet->ret.
Merge pull request #7201 from chengstory/cleanupBinaryLoader_AddSceneBinaryParse

Cleanup binary loader add scene binary parse