Use parser.seenval, add shorthand functions

Initial support for the Průša MK2 Multiplexer

Followup to #6940

G33 F and Height bug fix

added missing italian translation

Fix #ifdef AVR_AT90USB1286_FAMILY in pinsDebug

Can't compile with PINS_DEBUGING enabled on Atmega1284p because it tries
to enumerate pins 46 and 47 (which don't exist) because `#ifdef
AVR_AT90USB1286_FAMILY ` doesn't work as expected.

Updated Czech language

Added option 'H' to G29 P4.

Fixup length

Fixes #7150

- Added `H` to set a nozzle height adjustment to surface of the bed.
- Updated G29 P4 comments to reflect changes.

Add Skynet/ANET A10 support

Edit digipot currents via LCD, save to EEPROM

Fix: set digipot mcp4018 Vrefmax to 1.666V

Enhance G2/G3 with 'P' and G17/G18/G19 Plane Select

Addressing #6992 and #5851

Add link to F. Malpartida LiquidCrystal library

French update

* fix_planner_refresh_e_positioning

* Fix

Mesh with BABYSTEP_ZPROBE_OFFSET: add sanity check

Apply maths macros and type changes ahead of HAL

Use the raw position for mesh measurement. Otherwise the `M206` and
`M92` Z offsets will get canceled out by bed leveling. The downside is
`G29` will not compensate for a poorly set small `M206` fudge value.

To elaborate on this issue, imagine you are probing with a Z home
offset of -0.1, meaning when Z homes, -0.1 is the current position,
implying the ideal bed zero for the nozzle is 0.1mm higher than the Z
endstop. Ordinarily when printing, Z would raise 0.1mm higher.

What happens when we probe is that all points are measured with that
-0.1 included. So when bed leveling is enabled the `M206 Z` offset gets
exactly canceled out by the bed readings.

Step-by-Step Menu addition