MSYS2

Add `dev.py` implementing dev command shorthands #1380

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Run time

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Job	Run time
msys2 (mingw64, x86_64)	1m 39s
msys2 (mingw32, i686)	1m 50s
msys2 (ucrt64, ucrt-x86_64)	1m 40s
msys2 (clang64, clang-x86_64)	1m 45s
	6m 54s