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Remove legacy changes for double buffered SPI
Eliminate unecessary ESP32 SPI read/modify write
Eliminate two stage control bit changes (may impact some diplays with
setup/hold  timing and show ESP32 hardware register bug?)
Add single register write for CS and DC command
Make setAddrWindow smarter (as used in previous AVR library)
Improve compatibility with GFX sketches
Re-arrange comments slightly to improve positioning

ICST7735S red-tabbed 80x160 support

The library supported 240x240 ST7789 displays only which require an 80
pixel offset in rotation 2 and 3
The library now also supports the 240x320 display which has a different
RGB colour order.

This reverts commit 38d99a53.

Added ST7789 initialization

160x80 bgr

This reverts commit 1e152501.

datum marker was not in correct position on screens that are not 320x240 pixels

If PSRAM is fitted and enabled the Sprites are now created in PSRAM.
This makes multiple full screen buffers possible!

Four new examples have been added to show different methods of rendering
the anta-aliased fonts.  A few minor bugs have been corrected associated
with the font rendering. drawNumber and drawFloat handle fixed width
mono fonts with no digit movement.

(leave TFT SDO disconnected if other SPI devices share MISO)

(leave TFT SDO disconnected if other SPI devices share MISO)

unknown module 160x80 BGR inverted, offset 26
differs from adafruit of same size

#define SPI_READ_FREQUENCY  20000000 // Optional reduced SPI frequency
for reading TFT

Also weeded out some compiler warnings

Small performance improvement for ILI9488

ILI9488 is now supported in SPI mode as well as 8 bit parallel.

Setup20 added for ESP8266 and Setup21 addwd for ESP32