Feature: Fancy DFU on `blackpill-f4` #1859

Job	Run time
size-diff	48s
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 32s
build-mingw (windows-2022, ucrt64)	2m 48s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	4m 2s
build-mingw (windows-2022, clang64)	2m 35s
	13m 45s

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