Reduce shader permutations on iOS

Add option to compile iOS OpenGL ES or Metal shaders and whether to force 32bppHDR at each QL

If Metal shaders are a scalability option we can compile them only for high and compile only OpenGL for low.

For iOS we only really needed Mosaic for iPhone 4 which we no longer (offically) support. All devices we support have FP16.

We can support Encoding or Mosaic as render quality option for iOS because all devices including iPhone 4 do support GL_EXT_shader_framebuffer_fetch. That will bring back iPhone 4 support.

Should reduce the overall number of shaders.

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

Delay nodes occasionally don't fire the "Completed" output in a nativized build

Undefined sysmbol: typeinfo for AActor when cross-compile linux dedicated server on windows

I am not able to find world outliner how to enable it?

Installer 4.10 failed with error code R-1603

An error occurred while trying to generate project files !?

I can't open my map from the editor.

How can i modify the param name in EQS node

Bonjour j'ai un petit problème c'est que je ne vois plus l'onglet "scability" pour changer les graphismes de uefn et j'ai pas trouvé l'option pour le faire revenir ?