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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

See #618

pushRect() reinstated to pair with readRect() so swapBytes does not need to be changed from true to false before calling.

dmaBusy() checks and is no longer blocking
pushImageDMA() faster if setAddrWindow is not built into transaction list.