Implemented IR rawSend in IRsend class

[idankri]

Hi!
I noticed there is no implemented support for sending raw IR data.
The relevant function is written in IRLib_HashRaw.h, which had no include statement in IRLibCPE.h, and in addition the only linkage was broken:
The next line is a line is in IRLib_HashRaw.h:
#define IR_SEND_RAW case 0: IRsendRaw::send((uint16_t*)data,data2,khz); break;

The IR_SEND_RAW macro is used in IRLibCombo.h in IRsend class, in the send method, in order to send raw transmission. That will always result as an illegal cast between uint32_t to uint16_t* .
As a result it's impossible to use this method from the built-in IRsend object in the main object of CircuitPlayground.
IMO the send raw functionality should be separated from the other IR send's functionality as it receives different parameters.
Hope that helps :)
Idan