We can save more and a pile of RAM by eleminating the eqnBVector and
EqnAMatrix arrays next.

When a user executes a User Menu command, the LCD returns to the main menu. If the user has multiple menu items they want to run, such as one menu item per bed leveling corner, then it's better to stay in the User Menu rather than return to the main menu.

This PR modifies Marlin to stay in the User Menu after a command.

Fix compile error when UBL is enabled but there is no LCD Panel.

20x4 map integration.    Also some minor changes to the UBL Menu layout.     Both 20x4 LCD's and Graphical LCD panels should have similar functionality now.

Creality board is a Melzi / Sanguinololu variant, but using different pins for LCD control (and maybe other minor variations)

Fixes #7250

Addressing #7227

DISABLE_[XYZ] is incompatible with HOME_AFTER_DEACTIVATE and Z_SAFE_HOMING

Sends pre-defined string as action command when printer is kill.

Probing with the effector in the printing area, but an eccentric probe (e.g. allen key) outside it but still touching the bed gives meaninfull information for calibration. Since calibration is most accurate when probing as close to the towers as possible the testing was way to restrictive hence this fix.

-Update Arduino IDE extension descriptions
-Set default motor currents if not defined in Configuration_adv.h
-Support for MINIPANEL LCD
-Support for choosing internal or panel SD

Based on Infitary's own firmware settings.

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also an issue with ubl_motion.cpp

Also corrected compile issue when DEBUG_GCODE_PARSER and
AUTO_BED_LEVELING_UBL are both enabled.