Partly complete layout.

Pending schematic tasks:
1.  Replace 10 pin sensor board to main board connector with a higher
    pin count variant for unrouted signals on LED controller and
    RST,CHANGE pins on touch controller.
2.  Add pull ups on control and comm lines of touch and led ICs,
    as needed.
3.  Add mecahnism to set I2C address on LED controller.
4.  Identify purpose of and route COM pin on ULN2003LV.

Pending layout tasks:
1.  Route power and ground to top half and bottom right parts of board.
2.  Consider rotating touch IC 90 degrees counter clockwise to better
    match positions of b2b sensor connector and capsense buttons.