C# std::list changes to support types that are not assignable

Assignable fixes are based on those used by C# std::vector where the
default wrappers work if there is no operator== available in the
template type. Enhanced wrappers are obtained via a macro:
 SWIG_STD_LIST_ENHANCED(SomeNamespace::Klass)
 %template(ListKlass) std::list<SomeNamespace::Klass>;

Remove bool specialization (left over from the original std::vector
wrappers).
Add in missing typedefs.

Examples/test-suite/csharp/li_std_list_runme.cs

@@ -399,4 +399,4 @@ public class li_std_list_runme {
       }
     }
   }
-}
+}