Follow-up the PR #4271 (X_DUAL_STEPPER_DRIVERS)

Sled-probe sanity fix, conditionals for remaining types of leveling

Finalalize MSG_SD_WRITE_TO_FILE message with a \n

Make MAPPER_NON the fall back mapper - if no other is defined.
One list less to maintain.

Fixups for PID_ADD_EXTRUSION_RATE and HOTENDS==1

Finalalize MSG_SD_WRITE_TO_FILE message with a \n
else RH hangs.

・Update a forgotten Configuration_adv.h of K8400

Suppress warnings

Follow-up the PR #4024 (Greek Language by @psavva)

Fix for the PR #4256 (Additional tweaks for HOTENDS == 1)

Don't deploy/stow the probe if z-min-endstop is used for homing

Repair M100

X_DUAL_STEPPER_DRIVERS

Improve STATIC_ITEM implementation

Don't deploy/stow the probe if z-min-endstop is used for homing.
Don't apply `zprobe_zoffset` if probe was not used.

・Update forgotten Configuration.h of K8400

M100 D was running too long - caused watchdog resets.
M100 I showed more free memory than a Arduino Mega has RAM.

Two strategies to address a stuck buzzer

Adjust wait_for_cooling slope

Greek Language by @psavva

Adjust wait_for_cooling slope
and drop mintemp for cooling.

See
https://github.com/MarlinFirmware/Marlin/pull/4169#issuecomment-231544532

Update language_cz.h

Total print time for LCD correction (hours:minutes format)