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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

Other minor changes to tidy code up
Put back in ability to call init() multiple times in sketch

Rename file to match #include directive

Mismatch of case between filename and #include directive causes compilation to fail in case sensitive operating systems such as Linux. Rather than correct the filename in the #include directive I have chosen to change the filename to make it consistent with the other file of the similar name. A search indicates that this is also consistent with the official spelling of the font.

In 4 wire SPI mode the ILI9488 is not supported as it needs 18 bit colours spread across 3 bytes.