mck

mck is used at run time in 4 crates. It is a direct run-time dependency in 3 crates.

Depender (with downloads and own rev deps)			mck version
1.0K	1	machine-check		=0.4.0
950	1	machine-check-gui		=0.4.0
800	2	machine-check-exec		=0.4.0