Allow case light pin to be active low

Allow UART ISRs inside the stepper ISR

Fix redraw in SD Card menus

Fix for the PR #5072 (Add predefined AUTO_FAN_PINs to pins files), etc

Fix compile without ENABLE_LEVELING_FADE_HEIGHT

Support for an RGB LED using 3 pins

・Update forgotten Configuration_adv.h of Felix\DUAL and K8400\Dual-head

・Make descriptions the same as others

Adding ukrainian language support

Suppress warning

to capture chars at UART at 250000 baud.

.. and give the hint to try lower values if possible.

Support for COREYX, COREZX, COREZY

Improvement for ENSURE_SMOOTH_MOVES

Add a fade factor for mesh leveling

Keep drawing menu unless screen changes

Refine material heatup menu items

Fix and optimize case-light code

MENU_HOLLOW_FRAME for the menu screens

MENU_HOLLOW_FRAME for the menu screens and
some pixel shifting to optimize the look with tall fonts. (cn)

Not more then 4 stripes for u8g-devices

To optimise speed.
Costs well invested 128Byte of RAM.

Optimize graphical display with selective rendering

Fix USE_BIG_EDIT_FONT

Change font decent to -1 for tr and gr

For speeding up font drawing unify font decent.
Tr and Gr have ben the only fonts with a font decent of -2.
Sorry for some, a bit compressd, but hopefully still readeble symbols.