delete particle related code in GPU branch

src/gpu/core/GPU/CudaMemoryManager.cpp

src/gpu/core/GPU/CudaMemoryManager.h

src/gpu/core/GPU/GPU_Interface.h

src/gpu/core/GPU/GPU_Kernels.cuh

src/gpu/core/GPU/LBMKernel.cu

src/gpu/core/GPU/Particles.cu

src/gpu/core/LBM/LB.h

src/gpu/core/LBM/Simulation.cpp

src/gpu/core/Output/UnstructuredGridWriter.hpp

src/gpu/core/Parameter/Parameter.cpp

src/gpu/core/Parameter/Parameter.h

src/gpu/core/Parameter/ParameterTest.cpp

src/gpu/core/Particles/Particles.cpp

src/gpu/core/Particles/Particles.h