Various Laser / Spindle improvements (#15335)

Marlin/Configuration_adv.h

Marlin/src/HAL/AVR/HAL.h

Marlin/src/HAL/AVR/fast_pwm.cpp

Marlin/src/HAL/LPC1768/HAL.h

Marlin/src/HAL/LPC1768/fast_pwm.cpp

Marlin/src/MarlinCore.cpp

Marlin/src/core/drivers.h

Marlin/src/feature/spindle_laser.cpp

Marlin/src/feature/spindle_laser.h

Marlin/src/feature/spindle_laser_types.h

Marlin/src/gcode/control/M3-M5.cpp

Marlin/src/gcode/gcode.cpp

Marlin/src/gcode/motion/G0_G1.cpp

Marlin/src/gcode/motion/G2_G3.cpp

Marlin/src/inc/Conditionals_adv.h

Marlin/src/inc/Conditionals_post.h

Marlin/src/inc/SanityCheck.h

Marlin/src/lcd/dogm/status_screen_DOGM.cpp

Marlin/src/lcd/language/language_en.h

Marlin/src/lcd/menu/menu_spindle_laser.cpp