Support Arduino Uno R4

[designer2k2]

Hello,

EMUcan works on the Uno R4, but it will need a feature to be released: arduino/ArduinoCore-renesas#36

Until this is released its needed to manually install the latest Arduino Core to work on the R4

[designer2k2]

The Feature is added for the Uno R4, so its working now: arduino/ArduinoCore-renesas#79