fixed gil in automation module 

fixed 4.17 build 

added curve_generator script 

added 4.19 support 

fixed subclassing api 

fixed 4.16 support 

Linux and OSX fixes 

Merge branch 'master' of https://github.com/20tab/UnrealEnginePython

Update AsyncIOAndUnrealEngine.md 

added render_target_get_data_to_buffer()