Set PCL_ONLY_CORE_POINT_TYPES on Windows (Closes #833)

We are hitting the 65k objects limit in Visual Studio in the feature
lib. Adding PCL_ONLY_CORE_POINT_TYPES means they need to include the
.hpp files if they use other point types and code may not be cross
platform compatible. On the other hand, all other compilers seem to be
fine.
Merge pull request #897 from jspricke/windows_PCL_ONLY_CORE_POINT_TYPES

Set PCL_ONLY_CORE_POINT_TYPES on Windows (Closes #833)