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.

* [1.1.x] G33 magic numbers

* oops

* comments

* oops

* warning

* better comment section

* remarks

* extra grids

* Added M303 thermal runaway protection

Currently, thermal runaway protection is not available during M303.
Therefore, if someone plugs the thermistors in incorrectly and goes to
autotune their printer, the printer temperature could runaway and damage
could occur.

* Replace removed line, clarifying its logic

Removed by accident, I presume, when the file was cleaned up

* Fix case light "off" function

It would only turn the light off if brightness was 255

* Update Marlin_main.cpp

Addressing #6655

Addressing #8166

* [1.1.x] Fix NO_MOTION_BEFORE_HOMING unwanted behaviour

NO_MOTION_BEFORE_HOMING should prevent XYZ movements only when homing is not done.
E axes should be allowed

* Update Marlin_main.cpp

* Update Marlin_main.cpp

* Update Marlin_main.cpp

* Fixed M303 thermal protection

The temperature sanity checking logic was not being applied during M303
(pid autotuning) because instead of setting a target temperature, it
directly manipulated the pwm values.  When PIDTEMP/PIDTEMPBED is
enabled, PWM values rather than the target temperature determine whether
the heater is on.  I changed this to look directly at the PWM amount
when pid is enabled.

* Turn off heaters on M303 error

Currently, PID autotuning stops if it overshoots the temperature by 20C
or if if the temperature does not change for 20 minutes and it times
out.  I added calls to disable the heaters in these scenarios.

* Removed unnecessary if statement.

Added changes suggested by GMagician.

* Update temperature.cpp

* Update temperature.cpp

* Update temperature.cpp

[1.1.x] Add MKS GEN L board

* auto tune calibration parameters

* solve warnings

* Tweaks to formatting

* review Thinkyhead

* Error

Thanks @SCiunczyk

* 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

* use reduced sized font for some languages

* Fit Portuguese language files to existing scheme

* Rename language_pl-DOGM.h to language_pl_utf8.h

* Rename language_pl_utf8.h to language_pl-DOGM.h

* Update dogm_font_data_ISO10646_1.h

* Update dogm_font_data_ISO10646_1.h