* Encapsulate common LCD code in a singleton
* Depend more UBL code on UBL_DEVEL_DEBUGGING
  - Since most users don't need the debugging on at all times, this helps reduce the default build size for UBL by over 2K, a little closer to fitting on 128K boards.

* Followup to LCD_TIMEOUT_TO_STATUS=0
* Make continuous purge screen fit 20x4
* Unify purge message modes
* Preserve last-set pause header mode

* Fix to isPrintingFromMedia()

  - isPrintingFromMedia() will now return true even if SD print is paused.
  - isPrintingFromMediaPaused() allows UI to determine if the print is paused.

* Don't use _delay_us in minkill (#12145)

  - In HAL_DUE, _delay_us is simply an alias for delay, which causes the board to hang and subsequently reboot due to the watchdog timer.

* Shorten code with IFSD macro

- Remove `print_job_timer.stop()` from `disable_all_heaters`
- Call `print_job_timer.stop()` for relevant `disable_all_heaters()`.
- Split up `kill()` for watchdog interrupt safety

STM32 can reuse JTAG and SWD pins separately. Add `DISABLE_DEBUG` option to disable both interfaces and retain `DISABLE_JTAG` to disable JTAG only.

Some STM32-based boards may use multiplexed JTAG pins as IO. Up to now the `DISABLE_JTAG` option (defined in pins files) was only supported for AT90-based boards. This commit generalizes the code and adds support for boards based on STM32F1 and STM32F4.

- Move FWRETRACT to the planner
- Combine leveling, skew, etc. in a single modifier method
- Have kinematic and non-kinematic moves call one planner method

Make the endstop report method track endstop changes on its own.

- Also implemented real endstop reading on interrupt.

Better encapsulation and considerably reduce stepper jitter

`DONT_SWITCH` got lost along the way. Replace it with `DO_SWITCH_EXTRUDER` and adjust the code.

Fix #10699

Co-Authored-By: Zwaubel

Co-Authored-By: ejtagle <ejtagle@hotmail.com>

Allow the current command to complete when aborting an SD print, otherwise some commands (G28, G29, etc.) will cause trouble.