far too much

far too much

most important for future: will segfault for recursion as it stands,
need to find a way of going 'underneath' to evaluate things

but the changes are as follows:
added debugging functionality to print the builtins more clearly, and with their args.
required minimal changes in many places

but more importantly testing showed that I do have some sort of
working recursion, managed to implement a factorial function

still need to root around for any memory leaks from the new stuff