An LCD/OLED anti-screenburn feature. To use:
* copy Antiburn.tapp to file system
* Either issue Tasmota command antiburn or
* Programmatically using lv.antiburn()
The lvgl screen will change form black to red to green to blue to white each second for 30 seconds. The antiburn cleaning can be cancelled by touching the screen or it will complete after 30 seconds.
Beormund