Support for STM32H7 series

[gcharles81]

Hello first of all thank you for this library I currently use it on the 32F series ,

I would like to know if there is a possibility to support the STM32H7 series with this library Thank you

[JAndrassy]

maybe the code for one of the STM32F will work. compare the datasheets of F and H about the flash memory operations.

[vovagorodok]

Have the same issue with STM32WBxx or other STM32 with BLE:
vovagorodok/ArduinoBleOTA#30

platform = ststm32
board = nucleo_wb55rg_p

It's easy to add them?