PD op emulator & patch editor

All ops now load-able as PD classes using the external here:

https://github.com/rick-monster/aleph/tree/dev/utils/pd

Seems that most of the simple ops (e.g split, mul) work well.

To do:

• transmit patch data via serial to aleph from PD
• parse & generate .scn files from .pd netlist
• make basic aleph grid ops work inside of PD
• make polled aleph grid ops work inside of PD