C++ Proxies

class Optimized : public idg::proxy::cpu::CPU: CPU implementation, optimized for performance

class Reference : public idg::proxy::cpu::CPU: Reference CPU implementation, not optimized for speed.

class Generic : public idg::proxy::cuda::CUDA: Generic CUDA Proxy.

class GenericOptimized : public idg::proxy::cuda::CUDA: Hybrid Proxy, combines functionality from CPU Optimized and CUDA Generic proxies.