Add Metal renderer for Mac and iOS #3841
Merged
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The current OpenGL ES renderer has been deprecated for iOS since iOS 12.0
(https://developer.apple.com/documentation/opengles).
Thus we need to migrate to the new Metal API. The advantage of the new API is that it's also available for Mac OS (we use APIs that's supported for 10.14+ (https://developer.apple.com/documentation/metal/using_metal_to_draw_a_view_s_contents?language=objc)). This makes SDL no longer required for Mac and we can use the native Metal renderer instead.