sampleLight now correctly returns a SurfacePoint in the interface

RayTracer/shape/Light.h

 #pragma once
-#include "../camera/Hit.h"
+#include "../tools/SurfacePoint.h"
 
 namespace shapes {
 class Light {
    public:
-	virtual cam::Hit sampleLight() const = 0;
+	virtual util::SurfacePoint sampleLight() const = 0;
 };
 }  // namespace shapes
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