Feedback on girepository 2.0: Naming of get_type_info vs load_type

This is a minor point, but if you wanted to clean up the naming, now would be the time to do it, I guess.

One of these is the odd one out:

• gi_callable_info_load_arg()
• gi_callable_info_get_arg()
• gi_arg_info_load_type()
• gi_arg_info_get_type_info()

I guess because ..._get_type() is already taken by the GType function.