rmp3

rmp3 is used at run time in 4 crates (of which 2 optionally).

Depender (with downloads and own rev deps)			rmp3 version
1.0K		rustpbx		^0.3
1.4K		rustwav	optional	^0.3.1
		mp3cut		^0.3.1
	1	awedio	optional	^0.3.1