[Cleanup] Use std::is_base_of and std::enable_if

src/enum_parser.cc

 // Copyright Carsten Graeser 2012
 
+#include <type_traits>
+
 #include <dune/common/exceptions.hh>
-#include <dune/common/typetraits.hh>
 
 template <class Enum> struct StringToEnum : public Dune::NotImplemented {};
 
 template <class Enum>
-typename Dune::enable_if<
-    !Dune::IsBaseOf<Dune::NotImplemented, StringToEnum<Enum>>::value,
+typename std::enable_if<
+    !std::is_base_of<Dune::NotImplemented, StringToEnum<Enum>>::value,
     std::istream &>::type
 operator>>(std::istream &lhs, Enum &e) {
   std::string s;