- renamed the mpi module to parallel
- removed the communicationRoutine interface from gpu. gpu now also uses the communicator interface from parallel
- added missing functionality in parallel/Communicator
- moved ws2_32 library dependency on windows from VirtualFluids_GPU to parallel

- in header: typedefs for smart pointer usage

- completly switch to std::shared_ptr
- introduce IKernel Interface and CalculatorFactory
- extract Vector3D from UbMath
- introduce WriteObjectsCoProcessor

key is string now