Add support for AVANTEK D-3B

[X] create new plugin to gain initial support for a new protocol
[X] support basic receiving
[X] recv: process the repeatation (message is sent three times)
[X] recv: Have clarity about protocol: address/buttons/ids/...?
[X] recv: Have correct printouts of the received data
[X] recv: Do we have to decrement pulseIndex when !sequenceEndsWithHigh?
[X] support basic sending
[X] get clarification about RawSignal.Multiply ~and add it so sending part~
[X] we manipulate the buffer, we should restore it on all exists to not disturb following plugins
[X] migrate my tests to C/C++ (https://github.com/pfichtner/gcc-tdd-rflink-playground)
[X] 2_Signal.h defines RAW_BUFFER_SIZE 292 on ESP8266 (1200 for ESP32) one Avantek messages takes 114, the sender repeats it twice (three messages at all) 3*114=342, so we increase the buffer or we only will get two of the three messages on an ESP8266 -> when buffer is increased to 342 all three repeated messages are handled
[ ] get clarification about CRC (at least when sending we need understanding of it), the crc received is 00010011
[X] button receive: LSB or MSB?
[ ] button send: Really send 4x mancherster, even ef the String ist "1", send LSB or MSB?

pfichtner / RFLink32