FastLED-TFTWrapper::GFX, Display Wrapper for ArduinoOnPC

This is a quick an dirty (and slow) Framebuffer::GFX display wrapper for ArduinoOnPC

It is meant to be used with https://github.com/marcmerlin/ArduinoOnPc-FastLED-GFX-LEDMatrix/ to run https://github.com/marcmerlin/FastLED_NeoMatrix_SmartMatrix_LEDMatrix_GFX_Demos code (using FastLED, Adafruit::GFX, or LEDMatrix APIs).