Also, Max7219 debug code was used for this effort.   It has been
improved and hardened.

Based on #7883 by @studiodyne

Based on #7948

* Add files via upload

* Add files via upload

* Add files via upload

* Checked LCD / edited / revised pins_MKS_BASE.h

As requested :)

* Delete Configuration_adv.h

* Delete Configuration.h

* Deleted /Marlin/Marlin/src/config/examples/MksSbase/*.* and moved them to /Marlin/Marlin/src/config/examples/Mks/Sbase/*.*

* Add files via upload

Fix 'axis_unhomed_error' not defined error when pause with unhomed status

So now this script is compatible with both python versions 2 and 3

Signed-off-by: Alexey Shvetsov <alexxy@gentoo.org>

get rid of twi.h

move to board files

Setup FolgerTech i3-2020 Configuration files as a reference platform for
32-Bit work.

Also fix MAX7219 debug lights on 32-bit platforms.

Same as #7728 but for 2.0.x,
Lot of cleanup and remove references in whole code to other "LED files" than leds.h. Now will be much easier to add next drivers/libraries. e.g. FastLED. But bad news, currently FastLED is suporting only RGB devices (no RGBW)

Compiler error, added char c variable

Fix double character sent when TX buffer size is 0 on mega2560

* Auto-enable DISABLE_REDUCED_ACCURACY_WARNING if HOME_AFTER_DEACTIVATE enabled

If HOME_AFTER_DEACTIVATE, there is no need to warn on LCD since printer will home prior to starting print.  Saves 60 bytes PROGMEM on AVR with U8g panel.

* Reduce lines used

* Reduce lines used

Alternative to #7882. If F_CPU is greater than 1000 it can be evenly divided by 8. Over 10000, 16; over 100000, 32; over 1 million, 64; etc.

Add to controllerfan.cpp:
#include "../module/stepper_indirection.h"
#include "../module/temperature.h"

Change "extruder" to HOTEND in sanity error messages

This change initialize any data in eeprom.dat beyond the current file size to FF.
That way if eeprom.dat is deleted and created again, it doesn't take the old values or random ones, but rather starts with FF in all positions as a real brand new or erased eeprom.dat
Currently if you delete eeprom.dat and restart the board, the new file is created in the same sector with the same content, since FAT does not actually delete the data, just marks the sector as free. I tested by deleting the file, and then rebooting the board, and checking the file content.
The change can be tested in the same way, deleting, rebooting the board, and then the new content should be all FF.

If an eeprom file already exist with data on it, but smaller than E2END, it will be padded with FF on first access, so it will not have random or old content appended.