Adjust requestFrom, endTransmission, and startTransmissionWire to handle
repeated starts

This fix lock-ups on UART errors (for example when disconnecting
and reconnecting RX/TX wires or if the method Serial.begin is
called while another device is already transmitting).

 WIRE class finished. SERCOM class completed. Few correction in HardwareSerial and SERCOMUsart after compilation

Add SPI functions into SERCOM class and create SPI class