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2 new example sketches added for viewport demonstration

See #766

Simplified driver ST7789_2_DRIVER not supports 135 x 240 display.
This will not fix #763 since user specifies alternative ST7789_DRIVER which already supports 135x240 displays.

The SSD1963 support has been tested with a 480x800 pixel display from Buy Display.
Support for reading an ST7796 SPI display has been added.
pushToSprite added to keywords list.

#740: To avoid ambiguity the pushSprite for writing a sprite to another sprite has been renamed pushToSprite

#704: Change to 18 bit colurs for SSD1963 with SPI interface

Remove outdated TFT_SPIFFS_Jpeg example

Revert "Resolve ambigous pushSprite(int int int) methods"

Resolve ambigous pushSprite(int int int) methods

Fixes #736 and also delete color map even if the sprite has not been created.

Remove setWindow optimisation clash with TFT_eFEX

This reverts commit 31125ca5.

Add 2 new pushSprite functions:
1. Sprite to sprite
2. windowed are of sprite to screen
Examples to follow
Bug fixes to sprite class

Untested but looks correct!

Fix issue when using ESP32 & using multiple TFT displays & not defining TFT_CS.

Note: Future support for multiple displays in all possible hardware combinations may not be practical.

New function added:
  bool created(void);
to check if sprite has been rotated. Example:

if ( !spr.created() ) Serial.println("Sprite has not been created");

Update news, move tips towards end.

Add 4bit images to sprites, with an example and a tool to produce the images from bmp files.

Avoid coordinate optimisation for sketch controlled multiple TFT displays. Add #define MULTI_TFT_SUPPORT
to prevent setAddr optimisation that relies on coordinate transfer minimisation.

See new #define options in "Setup29_ILI9341_STM32.h"

Read_User_Setup now includes backlight settings

4bpp Sprites can now be pushed to the TFT with a rotation