Refactor schema to include MOSFET & optocouplers

Use N-channel MOSFETS for "high-side" switching
Add optocouplers to isolate control & bike circuits
10V LVR for bootstrap cap charge/power supply
Purge mislabeled connector (P2 was mislabeled as Pickit 3 conn)
Add screw terminal connectors

(labeling/numbering is still incomplete)