vscgpm: make output SPs accepted a single inputs dictionary, rather than input names.

[fsaad]

Therefore, every output SP will have the form

assume sim_output = mem((rowaddr, inputs) -> {...};

as opposed to the current convention

assume sim_output = mem((rowaddr, apogee_km, perigee_km) -> {...};

[fsaad]

Can't memoize on dicts...