Patch generic delta config

- 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.

Fixup warnings

Conflicts:
	Marlin/Marlin_main.cpp

Fix `code_value` (so `G1X1E2` isn't evaluated as `G1 X100 E2`)

- Patched up for most included configurations

The big Language Pack

use only one implementation for beeper feedback

Fix Z_APPLY_STEP for dual Z

Fixup leveling and other issues

Parentheses need here otherwise sanitycheck.h does wrong thing on line 222

Give all temp arrays 4 indices

- Also patch up some warnings

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

Latest upstream commits

Always 4 temp sensors

- Also a small tweak to SanityCheck.h

Avoid warnings in SanitiCheck.h

First aid for #1703

- 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.

Conflicts:
	README.md
Solved

Clean "fromsd" array if not SDSUPPORT

- Put + in front of positive values in the output

Instructions for Mesh Bed Leveling