Cleaned up and renamed 'radar_simulator'

Generate reverse look up (sensor to angle) table

Added 1 degree resolution single track gray code support

Removed redundant comment

Changed signature of HDLC find_frame(), experimental test of find_frame added to main()

Factored out the Rust HDLC code into hdlc.rs

Factored out HDLC FFI stuff

First code.

Initial commit