wip: Separate Xilinx code into hardware interfaces

.../sw/modular_quad_pid/src/hardware/hw_impl_zybo_mio7_led.c

...sw/modular_quad_pid/src/hardware/hw_impl_zybo_pwm_input.c

...w/modular_quad_pid/src/hardware/hw_impl_zybo_pwm_output.c

quad/sw/modular_quad_pid/src/hardware/hw_impl_zybo_uart.c

quad/sw/modular_quad_pid/src/hardware/queue.c

quad/sw/modular_quad_pid/src/hardware/queue.h

quad/sw/modular_quad_pid/src/iic_utils.c

quad/sw/modular_quad_pid/src/iic_utils.h

quad/sw/modular_quad_pid/src/initialize_components.c

quad/sw/modular_quad_pid/src/initialize_components.h

quad/sw/modular_quad_pid/src/log_data.c

quad/sw/modular_quad_pid/src/log_data.h

quad/sw/modular_quad_pid/src/main.c

quad/sw/modular_quad_pid/src/mio7_led.c

quad/sw/modular_quad_pid/src/mio7_led.h

quad/sw/modular_quad_pid/src/new_log_data.h

quad/sw/modular_quad_pid/src/old_log_data.h

quad/sw/modular_quad_pid/src/packet_processing.c

quad/sw/modular_quad_pid/src/send_actuator_commands.c

quad/sw/modular_quad_pid/src/send_actuator_commands.h