This library supports ILI9486 SPI TFT to use with Adafruit_GFX

The code is extracted from GxTFT and adapted for single controller use and Adafruit_GFX.

Can be used with the "special" SPI circuit found on RPi and Waveshare TFTs. Can also be used with the native SPI connection of the controller, as used on other TFTs.

• fixed fillScreen() for Landscape orientation

• added example Hello_U8g2_Fonts

• added example HelloWorld

• added 18-bit color handling for native SPI use

• fixed an error and some warnings
• added some optimizations that were not checked-in yet
• re-tested with ESP8266 Wemos D1 R2 and Arduino Due

• replaced RPi SPI kludge handling, better performance
• added method setSpiKludge()
• rpi_spi16_mode is on per default, switch off by setSpiKludge(false)

• added example constructors for Arduino Due to the examples
• tested with Arduino Due

• preliminary version
• works with my "3.5" TFT LCD Touch Screen Module 320 x 480 SPI RGB Display For Raspberry Pi B B+"
• https://www.aliexpress.com/item/32661117216.html
• only tested on ESP8266 Wemos D1 R2