See #16752

Allow `ENABLED`, `DISABLED`, `PIN_EXISTS`, and `BUTTON_EXISTS` to take multiple arguments. Also add:
- Alias `ANY(...)` for `!DISABLED(...)`
- Alias `ANY_PIN(...)` for `PIN_EXISTS(a) || PIN_EXISTS(b) ...`
- Alias `EITHER(A,B)` for `ANY(...)`
- Alias `ALL(...)` and `BOTH(A,B)` for `ENABLED(...)`
- `NONE(...)` for `DISABLED(...)`

See https://github.com/pinchies/Marlin/pull/1#issuecomment-471388743

Fix #9799 — hopefully not a unicorn

- Fix a bug in MAXxxxx thermocouple temp reporting.
- Add support for 3-wire HD44780.
- Add support for PCA9533 RGB driver.
- Add configuration examples for FlashForge CreatorPro.

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

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

…when used with an I2C screen.

Co-Authored-By: soimy <soimy@163.com>

* Add option to use Neopixel as case light

* Apply CASE_LIGHT_USE_NEOPIXEL to example configs

Same as #7728 but for 2.0.x,
Lot of cleanup and remove references in whole code to other "LED files" than leds.h. Now will be much easier to add next drivers/libraries. e.g. FastLED. But bad news, currently FastLED is suporting only RGB devices (no RGBW)