Log warning if UF2 block skipped due to mismatching family IDs

[NathanY3G]

This pull-request outputs a warning when a UF2 block is skipped due to mismatching UF2 family IDs. I found this useful when debugging an issue on my STM32F405 board.

If you believe this needs a discussion first or should be part of a larger logging effort then please feel free to reject it :grin:

[hathach]

there is a similar defined for logging here, would you mind update PR to use it instead. and also revert changes to the test files.

[NathanY3G]

Thanks for the tip @hathach. I will take a look at using this instead.

[hathach]

closed due to lack of response from user

[NathanY3G]

Sorry @hathach, I forgot about this MR. Thanks for closing it.

Seasons Greetings! :christmas_tree: