Timing logic added and verified with oscilloscope

firmware/include/clock.h

firmware/include/common.h

firmware/include/crystal.h

firmware/include/fifo_function_queue.h

firmware/include/timer.h

firmware/include/timing_logic.h

firmware/include/user_interface.h

firmware/smartwatch/main.c

firmware/src/clock.c

firmware/src/timer.c

firmware/src/timing_logic.c

firmware/src/user_interface.c