Add option for chip classes to add info to /rcinfo.

[eisental]

Some chip classes have additional information that's currently not displayed in /rcinfo but could be useful.
Adding a Circuit.getInfo() or something similar would allow to add new per-chip parameters to /rcinfo.

[Mordenkainen]

Might this also allow chips to specify the formatting for their input/output states? So chips can group inputs/outputs according to the chips definition?

So if a chip has 8 inputs, 1 clock, 4 address, and 3 data, it can show them as distinct inputs. I.E.

0 (0), 1111 (F), 101 (5)

Instead of:

0111101 (61)