v3f: mechanical rename and handle NULL res ptrs

The return by value variants of the vector-returning functions have
been renamed to be prefixed with an _.

Now the return by pointer variants lack any prefix as it's expected
they'll be more commonly used in practice.

Another change is the return by pointer variants now take the result
pointer as the first argument, and a NULL result pointer is handled by
dynamically allocating the result memory.

0 files changed, 0 insertions, 0 deletions