* Move special characters to language.h
* Apply some naming standards
* Clean up menu item draw functions
* Rename some Temperature methods
* UI => ExtUI

* Group status methods, share reset_status with Extensible UI
* Move common DOGM code to headers

* 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

Addressing #11271

* Apply #pragma once in headers
* Adjust some thermistors formatting
* Misc cleanup and formatting

- Drop `pgm_read_*_near` and let headers choose.
- Define `USE_EXECUTE_COMMANDS_IMMEDIATE` as a conditional.
- Add `process_subcommands_now` for SRAM-based commands.

- Followup fixes for menu refactor
- Fix TMC sanity checks, unused var warnings

* Fix Z value display
* Add HAS_PRINT_PROGRESS
* Alternative Info Screen option
* Add LCD_INFO_SCREEN_STYLE to example configs

- Enable filament change menu
- Enable bed-PID
- Enable s-curve acceleration
- Enable some menu items
- Update from Skorpi's new version
- Fix extruder steps, deactivate nozzle clean feature

* Universal tool-change Z lift
* Add TOOLCHANGE_ZRAISE to example configs
* Park/unpark changes to example configs
* Implement DEBUG_DXC_MODE

Co-Authored-By: TheLongAndOnly <thelongandonly@users.noreply.github.com>

Co-Authored-By: Giuliano Zaro <gmagician@users.noreply.github.com>

Co-Authored-By: timoxd7 <timoxd7@users.noreply.github.com>