Uno WiFi Developer Edition Serial1

Implements Serial1 of Arduino Uno WiFi Developer Edition board to access the on-board ESP8266. This library is a driver for SC16IS750 implemented for Arduino Uno WiFi Developer Edition as Serial1. This driver is necessary to communicate with the on-board ESP8266 over it's serial interface. The included tool EspProxy enables accessing the on-board ESP8266 over USB for 'flashing' tools (esptool, FDM), IDE sketch upload and Serial Monitor.