Add bitmask, ParticlePatch boilerplate code, tests

src/GPUManager.h

src/Integrator/CPU.h

src/ParticlePatch.cpp

src/ParticlePatch.h

src/ParticlePatch/CPU.cpp

src/ParticlePatch/CPU.h

src/ParticlePatch/CUDA.cu

src/ParticlePatch/CUDA.h

src/ParticlePatch/kernels.h

src/PatchOp.cu

src/SimManager.cpp

src/Tests/CMakeLists.txt

src/Tests/bitmask.cu

src/Tests/catch_boiler.h

src/Tests/matrix3.cu

src/Types.h

src/Types/Bitmask.h