There is no switchable Power Supply.   Don't put it on Pin 12.   
(Pin 12 is actually FAN1)

Add MS3 pins. Optimize SENSITIVE_PINS.

Co-Authored-By: TheLongAndOnly <thelongandonly@users.noreply.github.com>

Co-Authored-By: Giuliano Zaro <gmagician@users.noreply.github.com>

...Set no move earlier so it applies

Followup to #11994

* Clean up Temperature PID
* Improve EEPROM read/write/validate
* Group `SINGLENOZZLE` saved settings
* Group planner saved settings
* Group filament change saved settings
* Group skew saved settings
* Group `FWRETRACT` saved settings

Addressing #12048

Co-Authored-By: timoxd7 <timoxd7@users.noreply.github.com>

Previously, it was not possible for the TYPE argument to ultralcd menu macros to itself be a #defined value. This made it difficult to create variables to set many related menu items to a common precision that could be easily changed.

Also added details to the README to make sure the Ender-2 status is properly documented.

* Allow override of soft SPI pins in `pins_*.h`
* Add default case to avoid compiler warning.
* Additional pin definitions for Archim 2.
* Einsy Retro has same timings as Einsy Rambo.

- Makefiles require tabs (not spaces) before shell commands.
- Other indentation can either be space or tabs.

…and change a multi-use "back" menu item.