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The touch screen handler was broken for the ESP8266 only. The library
uses SPI write only configuration for ESP8266 so the SPI buffer can be
recycled and it was left in write only mode. The library now switches
back to read & write mode at the end of a transaction.

Adafruit_GFX font support extended to Unidode Basic Multilingual Plane
Print stream deocdes UTF-8
Smooth font ascent and descent (affects line spacing) changed to rely on
metrics provided by Processing IDE (issue #303)
Bug fix for font rendering with no background on RLE native fonts

Supports Adafruit_GFX compatible font format with characters in the range 32-255.

Note that the font rendering functions expect UTF-8 encoded characters/strings.

There is a bug in the ESP8266 Arduino core that averwrites the overlap
mode setup and hold bits for the hardware driven SPI SS line.  The
TFT_eSPI library has been patched as a work-around.

In overlap mode to maintain the required setup and hold times at 80MHz
ESP8266 CPU clock the SPI rate must be 27MHz or less. At 160MHz CPU
clock the SPI rate can be 40MHz.

ESP32 printf() can handle String type but ESP8266 cannot.

Add bounds checking to graphics functions
Rationalise variable types and style used to minimse type casting needs
(this change ended up being a more extensive refactoring than
anticipated - but once started...)
Add version reporting to diagnostic sketch
Boost PDQ graphicstest performance

Because Weather Underground will no longer support free API's

If the VSPI port is in use and pins are not accessible (e.g. TTGO
T-Beam)
then add or uncomment the following line in the setup header file:
//#define USE_HSPI_PORT

Minor performance tweaks for ESP32 to minimise the occurence of the slow
transaction overhead.

setAddrWindow now takes xstart, ystart, width and height as inputs

Multi-sample raw touch x and y for noisy displays

Example update for setAddrWindow change compatibility

A 16 bit color image can now be plotted into an 8 bit Sprite.

UTFT8 encoded Unicode values were not being drawn on screen with versions after 2.4.1 of the ESP8266 core.

The backlight control pin and ON state can be defined in the setup.h
file. Addresses #229, #226, #221

Comments updated and ILI9488 warning added.

Speed up Sprite rotation on an ESP32
Update utf8 serial decoder to handle illegal format strings
Remove need for D0_USED_FOR_xx (issue #271)
Clean up setup files
Correct various comment typos

Sprites can be rendered rotated with defined pivot points, 3 new
examples have been added "Rotated_Sprite_1/2/3".
The FLASH bitmap example has been moved to the Generic examples folder.
Boundary checks have been added to pushImage()
A new scrolling and wrapping in a Sprite example has been added.

Added new function that sketch can call to convert raw ADC x and y
values to calibrated screen coordinates:
tft.convertRawXY(&x, &y);

Redunced required number of SPI transfers needed to read raw values.
Changed mode so PENIRQ pin is enabled so users sketch can read this
signal (if needed).

See issue #279.

Fixes warning/error that is only reported with certain compiler warning flag settings ("All" in Arduino IDE).

Fixed bug where wrong wodth was returned for 1bpp Sprite
Improved speed for copying a 1bpp Sprite into another 1bpp Sprite (
affects Sprite pushImage() function only)
Added option to setup for colour inversion

Not tested by Bodmer, tested by s60sc as in #238