Introduction of a system to feed displays with the correct charsets. Example in language_de.h

This reverts commit 4d5b0e2037.

Defined the charsets plus a default.

Clean up some formatting

- Also partial cleanup of Marlin_main.cpp with a smidgen of Doxygen.

MSG_NO_MOVE = 'Kein Zug.' > 'Motoren Eingesch.' hat mich grau Haare gekostet.
Die englisch Meldung will sagen - Du kannst jetz am Extruder arbeiten, die
Achsen sind bockiert, die Motoren sperren die Achsen weil sie unter Strom
stehen, weil sie eingeschaltet sind.

to work out that this can't be resumed.

Add bq Witbox 3D printer

Make EEPROM storage consistent

Fixing wrong pin to heater extruder 2 <-> 3

- Also adds a language string for the error.
- Also adds SERIAL_EOL as an alias for SERIAL_ECHOLN(“”)

Should be reading 4 x 4 PID values instead of 4 x 3

Extruder 2 and 3 was swapped

Update ConfigurationStore to always write dummy values for disabled
options, including FWRETRACT, DELTA, and SCARA. Update the EEPROM
version to “V15.” Also fixes a buffer overrun with axis_scaling in
Config_ResetDefault.

Remove language strings that only add a number

Formatting cleanup of quiet sources

Rename lastnr to autostart_index and...

This won’t reduce the string storage in the end, but it makes the
language files smaller. Also removed remaining unused strings.

Split up pins.h to make pins more manageable

Remote has diverged, so pull

Also fix analogInputToDigitalPin so it uses proper C hex notation