- improve the interface of rtti to pass meta_obj_t* as parameter of type function to easy to access private/data

- rename some macro with RTTI
- add RTTI_MAGIC in object header
- add new rtti api

testsuite/meson.build

@@ -1,6 +1,7 @@
 librtti_test_srcs = [
   'test.c',
   'test_iter.c',
+  'test_invalid_obj.c',
 ]
 
 unity_dep = dependency('unity')