Compatability with renasas_uno architecture

[seaxwi]

The level of support for the renesas_uno architecture is unclear.

• The library.properties does not currently declare support for the renesas_uno architecture.
• The uno-r4-library-compatibility repository lists ArduinoGraphics as passing compilation.
• ArduinoGraphics is used by some examples in the Modulino library (which should run on UNO R4 WiFi):
  • examples/Modulino_Thermo/TemperatureHumidityMatrix/TemperatureHumidityMatrix.ino
  • examples/Utilities/FirmwareUpdater/FirmwareUpdater.ino

When compiling a sketch that includes the ArduinoGraphics library for an UNO R4 WiFi board, this warning is displayed: WARNING: library ArduinoGraphics claims to run on samd architecture(s) and may be incompatible with your current board which runs on renesas_uno architecture(s).

If ArduinoGraphics is considered is compatible with renesas_uno architecture, it should be declared in the library.properties file.

[leonardocavagnis]

Thanks for reporting!
Please, open the PR to fix it.

[seaxwi]

@leonardocavagnis Done! (#49)