Feature: experimental meson buildsystem #1724

Job	Run time
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 36s
build-mingw (windows-2022, ucrt64)	2m 37s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 50s
build-mingw (windows-2022, clang64)	2m 35s
build-linux (focal, 96b_carbon, rtt true)	41s
build-linux (focal, bluepill, rtt false)	37s
build-linux (focal, f072, rtt false)	41s
build-linux (focal, f3, rtt true)	36s
size-diff	45s
build-linux (focal, f4discovery, rtt true)	42s
build-linux (focal, hydrabus, rtt true)	38s
build-linux (focal, launchpad-icdi, rtt true)	37s
build-linux (focal, native, rtt false)	41s
build-linux (focal, stlink, rtt false)	37s
build-linux (focal, stlinkv3, rtt true)	39s
build-linux (focal, swlink, rtt false)	38s
	20m 30s

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