Reconnected all traces after layout optimizations

5V MODS even real?

Post Encoder routing overflow

Renamed op-amp reference voltage to 3V3_DIV2

Slightly modified encoder routing

Fixed general routing issues, moved thermistor off board (temp).

Changed GND polygon and board size to accomodate capacitors, added stiching vias to RMII transformer.

Merge branch 'taylor-thermistor' into mainboard-v2.0

Completed board routing.

Added breakbeam trace, added thermistor SPI jumpers