Change the VTKM_CONT_EXPORT to VTKM_CONT. (Likewise for EXEC and
EXEC_CONT.) Remove the inline from these macros so that they can be
applied to everything, including implementations in a library.
Because inline is not declared in these modifies, you have to add the
keyword to functions and methods where the implementation is not inlined
in the class.
1. Change set_property(...) to target_* commands
2. Remove explcit adding of CMAKE_CXX_FLAGS_WARN_EXTRA as compile option
3. Add /bigobj option to VTKm_COMPILE_OPTIONS under MSVC
