[Renderers/ANGLE] ANGLE Renderer Implementation

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ANGLE is a conformant OpenGL ES 2.0/3.0/3.1 implementation that translates between DirectX, Vulkan, OpenGL and Metal to use the native graphics API best suited to the hardware and OS of a system.

In practice this feature would look almost identical to a Clay GLES2.0 renderer. It would allow people making apps using ANGLE or OpenGL to use Clay without importing a higher-level library.