simplified the kernel factory infrastructure by omit the enum (Kerneltype) -> adding new kernels to the factory should be straightforward now

As the cuda warnings are different on each platform and super badly documented, we switch to suppress all warnings for the GridGenerator.

Fix various msvc compiler warnings. With msvc the compiler flags are explicit passed to nvcc with -Xcompiler.

As thrust is used in the gpu code, CUDA c++14 is required. Besides fixed compiler warnings in Parameter.cpp.

Remove some compiler warnings and added some cuda warning suppressions for the GridGenerator, as they are cluttering the build output.

Add the option for call linkBoost() without components. In that case cmake will just add the boost header dependency.

According to the cuda documenation (https://docs.nvidia.com/cuda/cuda-math-api/group__CUDA__MATH__DOUBLE.html#group__CUDA__MATH__DOUBLE_1g6d36757715384dc18e0483aa1f04f6c7)
pow() gets two double arguments. With the newest VisualStudio Version 16.8 these arguments needs to be passed as double explicitly.

Change in cmake: When BUILDTYPE is not defined in vf_add_library(), a library is build regarding the CMAKE_BUILDY_TYPE.

Exchange DEPENDS (which links everything private) variable with PUBLIC_LINK and PRIVATE_LINK. Therefore VirtualFluidsCPU is linking everything public know. Everything else is still linking private.