unistring 0.1.1

Helper functions for unicode in a terminal/monospace environment
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A few helper functions for manipulating unicode strings in a terminal/monospace font environment. This provides a trait on str to get a string's terminal width, and a couple of basic line-wrapping helpers.

Currently uses the GNU libunistring library (although I suspect it's feasible to rewrite into pure rust, and I may attempt that at some point)