STYLE: qualify Swap with Foam:: prefix (visibility)

- drop unnecessary Foam::Swap specializations when MoveConstructible
  and MoveAssignable already apply. The explicit redirect to swap
  member functions was needed before proper move semantics where
  added.

  Removed specializations: autoPtr, refPtr, tmp, UList.
  Retained specialization: DynamicList, FixedList.

     Special handling for DynamicList is only to accommodate dissimilar
     sizing template parameters (which probably doesn't occur in
     practice).
     Special handling for FixedList to apply element-wise swapping.

- use std::swap for primitives. No need to mask with Foam::Swap wrapper

applications/test/HashTable1/Test-HashTable1.C

@@ -366,8 +366,8 @@ int main()
     Info<< nl << "input values" << nl;
     Info<<"table1 =  " << table1 << nl <<"table2 =  " << table2 << nl;
 
-    Info<<"global Swap function" << nl;
-    Swap(table1, table2);
+    Info<<"std::swap function" << nl;
+    std::swap(table1, table2);
     Info<<"table1 =  " << table1 << nl <<"table2 =  " << table2 << nl;
 
     Info<<"swap method" << nl;