Unify M421

Adjustments to M100

Extend RGB LED with Printer Events

Allow 10mm Movements for Z-Axis

Fix MINIMUM_STEPPER_PULSE calculations

I use the movement options via LCD quite often. Especially to get the nozzle out of the way. I see no reason, why the 10mm option is disabled for the Z-Axis, this is why i always delete this line when i compile a new version.
If this is unwanted, please just close this PR

Have M109 / M190 do nothing with no parameters

Only lcd_synchronize needs no_reentry

Save / restore z_fade_height in EEPROM

Fix mbl_mesh_report

Fix EPROM -> EEPROM

M100 had numerious changes and quit working.   Part of the problem is
the overloading of the SERIAL_PROTOCOL functions.   Also, some of the
address arithmatic was changed to use char *ptr and passing ptr into the
SERIAL_PROTOCOL functions caused them to try to print a string instead
of a number.     M100 is working again.   Let's keep it that way!

M100 has been expanded to now have a function  int
free_memory_is_corrupted()  that can be called from other code to see if
the free space is still contiguous.  It may make sense to add a flag to
control its verbose nature but right now, the extra chit chat is very
helpful to know int free_memory_is_corrupted()  is doing the right thing
and what it found at various points when it was called.     A 'Show &
Tell' is coming up with int free_memory_is_corrupted().

When PARK_HEAD_ON_PAUSE is defined Marlin won't compile because of two missing semicolon.

These fixes are neede because before it showed the englisch text even if language = de was selected

Put TOSHIBA with other stepper driver options

Firmware was forgetting the z_fade_height in Planner, set by M420 Z<f>,
after each reset or loading settings from EEPROM. Added the float
z_fade_height to EEPROM-Storage, now remembers the value.

wt150 (Mightyboard Rev E) & RRD Full Graphic Smart Controller

Fixed comparison of float values to NaN

The `ftostr4sign` function got munged by the `WITHIN` patch

Init bed_level_virt_interpolate on EEPROM load

Cheaptronic V2

Add support for new electronics
www.reprapobchod.cz