Optim: replicate TraceRays optims to TraceSpheres/-Unordered TraceSpheres now scales better and earlier than it's serial counterpart: * TraceSphereUnordered vs TraceSpheresUnordered: 128 - 0.57ms vs 0.3ms; 1024 - 5.1ms vs 1.38ms; 8196 - 43ms vs 9.9ms * TraceSphere vs TraceSpheres: 128 - 0.64ms vs 0.44ms; 1024 - 5.6ms vs 2.2ms; 2048 - 11ms vs 4ms Tests: unit tests