MSYS2

Add `dev.py` implementing dev command shorthands #1377

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Run time

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Job	Run time
msys2 (mingw64, x86_64)	3m 11s
msys2 (mingw32, i686)	3m 21s
msys2 (ucrt64, ucrt-x86_64)	3m 15s
msys2 (clang64, clang-x86_64)	2m 55s
	12m 42s