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Added notes about reading from the display.

Tested on ESP32 and ST7789V display only. It may not work with other
displays!

Use:
#define TFT_SDA_READ

in setup file to use bi-directional SDA pin support.

Tested on an ESP32 with ST7789V display
SDA read is very slow on an ESP8266 (to be investigated)
Added new setup #define TFT_SDA_READ
Add new ESP32 and ESP8266 compatible in example/Generic folder to test
capture of TFT screen

// For ST7789 ONLY, define the colour order IF the blue and red are
swapped on your display
//#define TFT_RGB_ORDER TFT_RGB  // Colour order Red-Green-Blue
//#define TFT_RGB_ORDER TFT_BGR  // Colour order Blue-Green-Red

Corner case caused missed graphics.

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)