Improve Readme and mention an alternative controller implementation

[Loriowar]

Hi! Thanks for the description of the CTL SYS improvement. It was really useful for me. I did an additional investigation and put it here. To my mind, will be good to mention that project in your Readme to help other people in their improvements. If in short: the improved version takes into account the receiver messages and allows to build more stable and flexible logic upon the Festool receiver.