[OCaml] Runtime tests for default_arg_values, inherit_missing and some others

Add runtime tests for default_arg_values, inherit_missing,
memberin_extend, rename_predicates, template_inherit,
template_tbase_template, and typedef_classforward_same_name.

Examples/test-suite/ocaml/memberin_extend_runme.ml

@@ -0,0 +1,10 @@
+open Swig
+open Memberin_extend
+
+let _ =
+  let em1 = new_ExtendMe '() and em2 = new_ExtendMe '() in
+  assert (em1 -> "[thing]" ("em1thing") = C_void);
+  assert (em2 -> "[thing]" ("em2thing") = C_void);
+  assert (em1 -> "[thing]" () as string = "em1thing");
+  assert (em2 -> "[thing]" () as string = "em2thing");
+;;