https://docs.unity3d.com/Manual/iphone-playerSizeOptimization.html
http://stackoverflow.com/questions/34076280/app-size-too-big-ios-unity-3d
https://docs.unity3d.com/Manual/ReducingFilesize.html
https://support.unity3d.com/hc/en-us/articles/208412186-IL2CPP-build-size-optimizations
http://answers.unity3d.com/questions/1149641/very-large-ios-build-size-unity-5.html
http://answers.unity3d.com/questions/357667/why-is-my-ios-app-size-an-order-of-magnitude-large.html
