Add support for SOLENOID_PROBE

CORExx endstop detection fixes

Resolve 'steps_to_mm was not declared in this scope' compilation error after recent changes to merge babystepping with M851

1. The CORExx printers were checking more endstop axis than needed.

2. Removed all the CORE_xx_NOT logic.  The motor_direction(xx) routine
always returns the correct data so it is not needed.  It was actually
cause the wrong direction to be checked in some cases.

3. Made the logic/defines for X, Y & Z axis all the same.  The old logic
checked inappropriate configurations for Y and didn't check all the
correct configurations on Z.

4. Added a check for zero steps before the X, Y & Z axis.  Previously
would check the they axis even if there were no movement.

All the memory accesses need to be unsigned char in  order to avoid
false errors being detected.   Two new features are available for
developers to call into the M100 functionality to look for data
corruption.

Make BABYSTEP_ZPROBE_OFFSET an optional feature

BABYSTEPPING updates Z probe offset

Sanity check per-axis options' array sizes

Make ADC sensor reading frequency adjustable

Simplified M20 with size

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