With My experimental Shadertoy renderer and GLView

[chenqiu1024]

I have been working these months on my own Shadertoy renderer for iOS, mostly in Swift 5.0.
Some of the shaders that the original version cannot render can be successfully renderer by this experimental version, such as ‘Super Mario World 1-1’ and ‘Happy Jumping’.
Some other shaders that can be properly rendered by the original version, however, look bad on my version, or even crash sometimes. I am still trying to solve that. Thus I just preserve the original renderer and make mine as an alternative version: By tapping the “info” button you’ll get a “Try using experimental GLView” option, then click it to switch to my renderer.
In order to debug OpenGLES function calls in case the Xcode’s GPU debugger does not work properly, I also duplicated another build target ‘Shadertoy_debug’ which uses fishhook to hook all GLES 3.0 function calls.
In addition, I also updated AFNetworking version to fix some compatibility issues.