Update to libWiringPi v2

- Fix number of argument check in pinModeAlt
- Add support for drcSerial
- Add support for max5322
- Add support for mcp23s08
- Add support for mcp3002
- Add support for mcp3004
- Add support for mcp3422
- Add support for mcp4802
- Add support for mcp23008
- Add support for mcp23016
- Add support for mcp23017
- Add support for pcf8574
- Add support for pcf8591
- Add support for softPWM
- Add support for softServo
- Add support for softTone
- Add support for sr595
- Add support for wiringPiSPI
- Add support for wiringPiSerial (wiringPiSerialPrintf not implemented
yet)
- Add support for wiringPiShift