Move libfuzzer to a separate package

[brson]

(Original title: "Remove the fuzzer")

This code is very bitrotted.

[brson]

@jruderman opinions?

[erickt]

We should factor this out into a cargo (or whatever we're calling the third party packages nowadays). It's a shame it didn't really get used, but it could be really useful if modernized.

[graydon]

I'd like to do quite a lot of work on quickcheck-like and random testing; just keep deferring due to more pressing stuff

[graydon]

Still undecided as of 2013-06-05. I support moving it to a separate package at this point (or as soon as rustpkg is sufficiently mature to handle that). In general I want to make a package that deals with formal grammars (BNF) and can both parse/print them and do combinatorial random generation on them.

[pcwalton]

I don't think this is backwards incompatible.

[brson]

This code is seriously bitrotted. It has not been used in years - much of it isn't even included in the build. Not suggesting we shouldn't do fuzzing, nor that it isn't appropriate to live in-tree, but this code is never going to be used again.

[graydon]

Agreed

[z0w0]

Closing, fuzzer was removed in #7166.