Change TCA6416A to incorporate package suffix, add QFN footprint.
Symbol: TPS54821 had un-numbered pin.
Footprint: Add for TPS54821.
Footprint: Add IPC RESC2012X70N
Footprint: Add IPC SOT95P280X125-3N for numbered and MOSFET symbols.
Footprint: Bourns inductors SRN6045, SRR1260, SRR1280.
PCB: Move IPC_SOIC modules to new .pretty library.
PCB: Slight footprint pad adjustment.
PCB: Finished routing USB front-end. Clean-up still needed.