Added footprint for 33 ohm resistor

Added fp library for resistors.

Added directories for passive components

Connected nets for preampOut on schematic

Added footprints for XORs in PCB layout

some pins from clock gen and counter need to be connected to microcontroller, some ERC bugs are fixed

Added footprints for XOR

Resolved some ERC violations on top-level schematic

Added footprints for CDR, temp sensor, and laser driver

Regenerated netlist. Updated PCB to include new footprints.