mod_use

mod_use is used at run time in 7 crates. It is a direct run-time dependency in 6 crates.

Depender (with downloads and own rev deps)			mod_use version
400		vow		^0.2.1
350		qbit-rs		^0.2.1
		r18		^0.2
		shot		^0.2.1
	2	r18-trans-support		^0.2.1
		cargo-r18		^0.2.1