Channel Offset for PPM outputs

Add a parameter the PPM settings in receivers, so that channels coded as PPM can have an offset towards higher channel number.

Currently PPM6, sends channels 1-6.

With a new PPM Start Channel = 11, PPM6 would send channels 11-16

This would be nice for controlling aux devices that use ppm on higher channels above the lower primary (thr, pitch, roll, yaw) channels.

With option computed the ppm Out signal of the receiver can be changed however you want.
With greets
Harald

Thx, I did not know that channel mapping applied.
But can I map ppm8 on an R3? How do you map, 4-8?
I understand how I could map pins on an R9.

If I need bigger rx, I thinking having a start channel with in direct mode is still a valid request.