Add support for BQ Prusa i3 "Hephestos"

Avoid compiling error

Only a missing ","... now it will compile again

Add FAN1_PIN and SERVO0_PIN

Fix nozzle in temperature menu

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

This reverts commit 4d5b0e2037.

Fix number of nozzle displayed in temperature menu.

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.