Added support for Raspberry Pi's wiringPi C/C++ library

[jirkavavrik]

I made soma small chganges to this library to make it usable on both Arduino IDE and on Raspberry pi using wiringPi library in C/C++. There are only some small changes: -some macros - using #ifdef WIRINGPI - I thought that this would be the easiest way to make it work on both platforms -i had to use Print.h (and .cpp) file from Arduino as Print_rpi.h (and .cpp) to have print() and println() functions working in wiringPi I made some basic testing - displaying text on both Arduino Leonardo and Raspberry Pi Zero to make sure it works as it should