PWM encode/decode is working using a FPGA

Tested FPGA based pwm encode/decode.  Using Hobby King HK-16A V2 6 channel transmitter and decoding 6 channels of PWM from the receiver..  Encoding 4 PWM with a 1-2ms pulse width to 4 ESCs.  The biggest issue generating PWM is to complete the last cycle before apply the next update.  

Next step is to integrate into BetaFlight Linux Port, the goal is to be flying in a month.

All the code is on github.