wip: Separate Xilinx code into hardware interfaces

quad/.gitignore

quad/lib/queue/.gitignore

quad/lib/queue/Makefile

quad/lib/queue/queue.c

quad/lib/queue/queue.h

quad/lib/queue/test_queue.c

quad/lib/test/Makefile

quad/sw/.gitignore

quad/sw/imu_logger/src/iic_mpu9150_utils.h

quad/sw/modular_quad_pid/src/callbacks.c

quad/sw/modular_quad_pid/src/callbacks.h

quad/sw/modular_quad_pid/src/communication.c

quad/sw/modular_quad_pid/src/communication.h

quad/sw/modular_quad_pid/src/controllers.c

quad/sw/modular_quad_pid/src/gam.h

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

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

...sw/modular_quad_pid/src/hardware/hw_impl_zybo_axi_timer.c

...modular_quad_pid/src/hardware/hw_impl_zybo_global_timer.c

quad/sw/modular_quad_pid/src/hardware/hw_impl_zybo_i2c.c