Move 'lcd_bootscreen()' from `lcd_init()` to 'setup()' where it is cexecute exactly once. Saves 'bool show_bootscreen'.
Move the call of 'lcd_custom_bootscreen()' to the begin of 'lcd_bootscreen()'.
Move the delays into the related functions.
Move the picture loop around 'lcd_kill_screen()' into the function.

Addressing #8166

* auto tune calibration parameters

* solve warnings

* Tweaks to formatting

* review Thinkyhead

* Error

* Initial conflict resolution

All previous items resolved:
- Use of ELAPSED() on timer code
- Switch to use of defer_return_to_status=true as much as possible
- Update & Clean Up of Max7219 routines

* Resolve non-SD case in ultralcd.cpp

set_destination_to_current() changed to set_destination_from_current()

set_current_to_destination() changed to set_current_from_destination()

Based on #7637 by @marcio-ao

Based on #7975 and #7979

Addressing #7745

Added new configuration to inhibit XYZ movements when home is not done

* matrix names update

* symplified names

* new angle normalization

* ABC

* axis

* least squares

* recalc_delta_settings

* endstop_adj

* 0p

* bug

* UBL_Language_Update

Translatable strings

* Use slightly better wording...

* Use slightly better wording...

* Disallow filament change while paused

* Use kinematic movemements in pause_print and resume_print

Correcting the storage selection.
Also EEPROM error handling on the LCD.

* Fix compilation of ADVANCED_PAUSE_FEATURE without SDSUPPORT

* Fix Identation

* Make use of IS_SD_PRINTING macro

as per @MagoKimbra

Add a parameter to enable/disable audible user script feedback

Filament change causes freeze during paused print. This PR disables Filament change in the prepare menu when a print from SD Card is paused. See #7395

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.