Add possibility to define multiple PTT and DCD outputs

[joecotton]

Would it be possible to allow defining mulitiple PTT and DCD outputs? In this way, on a Beaglebone Black or RPi, one could have a PTT to trigger the radio and another to trigger one of the on-board LEDs as TX indicator.

[va7acq]

I would also love to see this happen! When using a CM108 to handle the PTT, I would like to be able to light a TX LED using the GPIO pins on a Raspberry Pi.

[wb2osz]

Duplicate of issue 61.
#61