Add support for STM32F7 MCU

Marlin/Marlin.ino

Marlin/src/HAL/HAL.h

Marlin/src/HAL/HAL_STM32F7/EEPROM_Emul/eeprom_emul.cpp

Marlin/src/HAL/HAL_STM32F7/EEPROM_Emul/eeprom_emul.h

Marlin/src/HAL/HAL_STM32F7/EmulatedEeprom.cpp

Marlin/src/HAL/HAL_STM32F7/HAL_STM32F7.cpp

Marlin/src/HAL/HAL_STM32F7/HAL_STM32F7.h

Marlin/src/HAL/HAL_STM32F7/HAL_Servo_STM32F7.cpp

Marlin/src/HAL/HAL_STM32F7/HAL_Servo_STM32F7.h

Marlin/src/HAL/HAL_STM32F7/HAL_spi_STM32F7.cpp

Marlin/src/HAL/HAL_STM32F7/HAL_timers_STM32F7.cpp

Marlin/src/HAL/HAL_STM32F7/HAL_timers_STM32F7.h

Marlin/src/HAL/HAL_STM32F7/README.md

Marlin/src/HAL/HAL_STM32F7/SanityCheck_STM32F7.h

Marlin/src/HAL/HAL_STM32F7/TMC2660.cpp

Marlin/src/HAL/HAL_STM32F7/TMC2660.h

Marlin/src/HAL/HAL_STM32F7/endstop_interrupts.h

Marlin/src/HAL/HAL_STM32F7/fastio_STM32F7.h

Marlin/src/HAL/HAL_STM32F7/persistent_store_impl.cpp

Marlin/src/HAL/HAL_STM32F7/spi_pins.h