hff-core

hff-core is used at run time in 4 crates.

Depender (with downloads and own rev deps)			hff-core version
250		hff		^0.6.1
160	1	hff-tokio		^0.6.1
150	1	hff-async-std		^0.6.1
	3	hff-std		^0.6.1