C function Logos directives

Added %hookf and %origf directives for hooking C functions while supporting groups and using a variant of %orig.
%hookf takes a variadic number of arguments: the function return type, the function name, the function argument list. It generates the original function function pointer from these values and the current group.
%hookf takes a variadic number to pass to the original function, which is calculated from saving the current function name in %hookf and the current group.
`Logos::Generator::Base::Function` should have the generation code for this.

`_logos_function` and `_logos_orig_function` can be generated using the `sigil` function at the beginning of logos.pl. Check out how the other generators use `sigil`.