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This reverts commit 38a05776.

This reverts commit 6dec790e, reversing
changes made to 8146ac30.

Add setLabelDatum

Requested change in #537

OR has precedence over AND so brackets needed.
Remove unused varaible.

Added 24 bit colour handling alphaBlend to reduce precision loss in multiple blend stages (e.g. in 2D colour gradients). Added option for alpha dither to reduce colour banding in gradients with 16 bit colours.

Get rid of compile warnings.

The library has been cleaned up as it has got a bit untidy due to the large number of small incremental changes.

4bit Sprite examples renaed to be consistent with others.

alphaBlend example moved to generic folder (alphaBlend fn was moved to TFT_eSPI class).
Added sections + explanatory comments to functions prototypes.

Temporary comments added for potential gotchas for noobs when using DMA.

spi_begin/end functions renamed to reflect functionality. Old fns  retained for backwards compatibility with user setup.h files.

Add Sprite 4 bit color depth option with a defined palette of 16 colors. Add new Sprite examples.

Set font for Transparent_Sprite_Demo_Colormap to correct value (4)
renamed setColorMap to createPalette
renamed cmpPixel to readPixelValue
added setPaletteColor / getPaletteColor
added error check to createPalette

RPi MHS-4.0 inch Display-B type display now supported.

The s60sc Adafruit_Touch library fork for the ESP32 parallel mode uses the TFT_WR pin as an analogue input to read the screen resistance.  The TFT_eSPI library kept TFT_CS low permanently for performance reasons, but when used with the touch library a low analogue value on the TFT_WR pin will write spurious data to the display. 

This change toggle TFT_CS so it is only low during TFT parallel bus writes. The performance reduction is small.

ILI9488 not compliant to datasheet with extra clock pulse?

Add TTGO T-Wristband config

Update to accommodate smooth font rendering, which need a background colour specified.

Add: Destructor of TFT_eSprite.