Thanks to @jbrazio #3301

This is the easiest way to make button pin testing consistent without
renaming all the button pins. Just make a macro especially for testing
if button pins are set, since they are named consistently in the pins
files.

copy of 406992f9dd

Also add mbl.z_offset to the EEPROM, bumping the version to V23.

Following up on #3231

Fixes for #3189

Setting a temp is still missing

Adds the parameter U to M303. If U1 is included , it will use the
PID-values from the auto-tune.

Alternative fix to #3149

Extend stack_overflow_protection for lcd_move_e() and _lcd_level_bed() with
a refined method of 3050.

Expected behavior: After editing a value the menu should return to the
previous place with the edited item selected.
Actual behavior: Either the top (back) item from the previous screen is
selected, or the menu jumps up another level.
Solution: Pass the correct arguments to `lcd_goto_menu` on click when
editing a value.

Related to MarlinFirmware/MarlinDev#270

Apply `constrain`, `NOMORE`, `NOLESS` and `CRITICAL_SECTION` macros
wherever possible.

Based on #2860 - rebased for RCBugFix

Implement and test blinking for char-lcds

# Conflicts:
#	Marlin/ultralcd_implementation_hitachi_HD44780.h
solved

Fix crashes when the Z axis is moved via LCD
by calling `plan_buffer_line` only when there is enough room in the
planner buffer, to avoid endless recursion.
A brief description about what went wrong is in #1166