add pulse trigger mode

[martin131]

Hi, I am not using this firmware yet, because I need the binding mode on my zbminir2 with pulse mode. Is it possible to implement it? Or should I hope for an official firmware with binding? :-)

[DJTerentjev]

Please add support for pulse mode.

[NikolayKash]

@ius , could you please add pulse mode and share compiled firmware?

Thanks!