[RF] Added Pilight RAW packet return support

[V1pr]

Description:

This PR adds RAW packet support for Pilight module. Once the ability is enabled before compile, the RAW packet return can be enable/disabled with MQTT command:

mosquitto_pub -h 127.0.0.1 -m '{"rawEnabled":true}' -t "home/SonOff_RFB/commands/MQTTtoPilight/protocols" -d

The returned JSON looks like this:
Client (null) received PUBLISH (d0, q0, r0, m0, 'home/SonOff_RFB/PilighttoMQTT', ... (176 bytes))
{"format":"RAW","rawlen":106,"pulsesString":"c:0102010102020202020101010101010102020201020102020202020201010101010101010101010102010102010201020201010203;p:521,944,1924,3845@"}

The pulseString format is Pilight's native. For those who are not familiar with it:
c:* are the indexes for the p:* array, which are the different pulse length. (e.g. pulse[0] = 521ms, pulse[1]=944ms..., so c[0], which is a '0' = 521ms pulse, c[1], which is a '1' =944ms pulse etc)

Checklist:

• The pull request is done against the latest development branch
• Only one feature/fix was added per PR and the code change compiles without warnings
• I accept the DCO.

[V1pr]

@1technophile pls review

[1technophile]

Done. Could you update the docs also to explain how to make it work:
https://docs.openmqttgateway.com/use/rf.html#pilight-gateway

[V1pr]

Done. Could you update the docs also to explain how to make it work: https://docs.openmqttgateway.com/use/rf.html#pilight-gateway

@1technophile done all the changes, edited the docs too.

[1technophile]

@V1pr I'm not seeing the docs update, am I missing something ?

[V1pr]

@1technophile my bad, overlooked and the change was created under a new branch... fixed.

[1technophile]

Thanks