Confirmed Sanity checks are working.....

Code cleanup for Z_PROBE_AND_ENDSTOP.
Added Z_PROBE_PIN to pins_RAMPS_13.h

Another fellow here gave me the idea to do it this way

Made my swap commented out so its the option not the default.

This reverts commit 15028e9b08.

I made my changes to swap MIN and MAX endstops on the Azteeg X3 Pro the
option rather than the default to fix unexpected reversal.

Updated for the changes that Thinkyhead made before I submitted mine.

I added in the pins into the new board files for the Azteeg X3, X3 Pro,
Printrboard, and Rambo. I'm sure it can be added for others too but
these are the manual specified pins. Just like many things here though,
I can't test for the boards other than the Azteeg X3 Pro. Hopefully it
works smoothly for everyone who happens on this nifty display. :)

- Add some documentation to planner and stepper headers
- Patch up RAMBO pins with undefs
- Add `sync_plan_position` inline to set current XYZE
- Swap indices in `extruder_offset` to fix initialization values

I added the fan pins in here and left them at -1 in configuration_adv.h
and it works fine. Pinned for a 4 extruder from 1-4 and HE5 being the
controller fan, HE6 being the Extruder Auto Fan/Water pump in the Kraken
case, and HE7 being for part cooling fan. Added in descriptions for the
MIN MAX pin swap and for servo motor additions.

- Addressing issue mentioned at #1699

to avoid warnings about unused blink.

Concentrate definitions of variables in dogm_lcd_implementation.h to one place.

Make only local used variable currentfont static.

be.
Added Sanity Check for it.
Added hook so it's enabled.

Typo fixes in comments in existing code.

- Patched up for most included configurations

- Also patch up some warnings

- Fix a bug reading `code_value` for `M503 Sn`
- Hide and remove unused variables

- Also a small tweak to SanityCheck.h

- Increase the probe offset range to -20…20
- Apply the range limits to the menu item

/SanityCheck.h:107:53: warning: missing terminating ' character
...

to avoid:
Marlin_main.cpp:1790: warning: array subscript is above array bounds.

- Put + in front of positive values in the output

Don’t set CUSTOM_M_CODE_SET_Z_PROBE_OFFSET if there’s no Z probe

- Init `zprobe_zoffset`
- Remove `current_position[Z_AXIS] = zprobe_zoffset` lines from the
`set_bed_level_equation_*` functions
- Apply standards to `mesh_bed_leveling` files
- Document `MESH_BED_LEVELING`