UE4 异步资源加载

http://blog.csdn.net/pizi0475/article/details/48178861

http://blog.sina.com.cn/s/blog_710ea1400102vlyl.html

https://docs.unrealengine.com/latest/CHN/Engine/Basics/DerivedDataCache/index.html

https://wiki.unrealengine.com/Dynamic_Load_Object

https://answers.unrealengine.com/questions/51867/how-to-load-assets-that-arent-part-of-a-build.html

通过FCoreDelegates::OnMountPak.Execute(Pak路径, 4)，
这一步加载Pak文件，加载完了之后，就可以通过资源路径引用这个Pak中的资源了，用StaticLoadObject