fix fading issues #4492
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fix fading issues #4492
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fixes #4392 fixes #4465
The slow fade in bootloader was due to function raising backlight was taking too long, waiting for display TE signal each time. Waiting for TE is removed as its no longer needed due to different mechanism using pending update - so now we will normally wait only once, after the display content is changed. In addition, the backlight fading function is rewritten to ensure constant fading time, at the possible expense of smoothness.
To mitigate the residual image issue, additional wait cycle is added when raising backlight.
As part of this fix i did i minor refactor, fading from python is now done by calling rust functions. The behavior of the fade is unified, so fading from python will behave a bit differently
Additional problem with fading is done before display refresh in progress layouts is fixed.