Fix Metal backend and macOS build setup#37
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Add Rendering/MetalBackend.h and MetalBackend.mm which create a CAMetalLayer from a GLFW window (getMetalBackend). Update WGPUContext to use getMetalBackend for wgpu::SurfaceSourceMetalLayer instead of using the NSWindow directly. Modify CMakeLists to include the Metal backend source/header in the library, add APPLE-specific target_sources and link Cocoa/Metal/QuartzCore frameworks (using find_library and -framework flags). Also add a minor include fix in Engine/math/Vec2.h (include <stdlib.h>).
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Add Rendering/MetalBackend.h and MetalBackend.mm which create a CAMetalLayer from a GLFW window (getMetalBackend). Update WGPUContext to use getMetalBackend for wgpu::SurfaceSourceMetalLayer instead of using the NSWindow directly. Modify CMakeLists to include the Metal backend source/header in the library, add APPLE-specific target_sources and link Cocoa/Metal/QuartzCore frameworks (using find_library and -framework flags). Also add a minor include fix in Engine/math/Vec2.h (include <stdlib.h>).