sk-core

sk-core is used at run time in 5 crates.

Depender (with downloads and own rev deps)			sk-core version
230		skctl		^2.1.0
230		sk-tracer		^2.1.0
220		sk-driver		^2.1.0
220		sk-ctrl		^2.1.0
	3	sk-store		^2.1.0