[lucy-dev] Wrappers for Obj functions

[Nick Wellnhofer]

Lucifers,

When converting Obj_Is_A, Obj_Get_Class, and Obj_Get_Class_Name from methods 
to functions, I added autogenerated inline function wrappers for each class 
that make it possible to call these functions without casting the invocant to 
Obj. Now I moved Err_downcast and Err_certify to Obj, and these functions use 
a macro as wrapper. We should use the same approach for all these wrappers.

Inline functions provide more type safety but they pollute the function 
namespace of subclasses. Macros are generally shorter, at least when using 
"short names", but they're ALL CAPS.

We could also think about a more generic approach and make CFC create inline 
function wrappers for every function in a superclass that has a method-like 
invocant as first argument. Something like non-virtual methods in C++. This 
could also be triggered by a new function modifier. It should also be possible 
to autogenerate host language bindings for this type of function.

Nick