Moved is_same implementation to detail (both directory and namespace)
to use in the public headers and avoid introducing new dependencies.
The documentation now recommends users to use Boost.TypeTraits or
C++ standard library instead.
Also, removed unnecessary includes and added missing ones in a few
places.
Jamfile parser created incorrect test for fclose_deleter_test,
which resulted in a compiler error. Prevent the parser from creating
the test target by reformatting the Jamfile and create a CMake
target with proper dependencies.
