Removed datap* projects

They have been superseded by the enet_udp, adis, and servo_control
projects.
Removed si and udp_pwm_control projects

si has been replaced by flight-imu
udp_pwm_control has been replaced by servo_control
Added net_addrs from av3fc, also cleaned adis

net_addrs is going forward the canonical definition of RNet addresses
across all projects