auto merge of #15619 : kwantam/rust/master, r=huonw
- `width()` computes the displayed width of a string, ignoring the width of control characters. - arguably we might do *something* else for control characters, but the question is, what? - users who want to do something else can iterate over chars() - `graphemes()` returns a `Graphemes` struct, which implements an iterator over the grapheme clusters of a &str. - fully compliant with [UAX#29](http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries) - passes all [Unicode-supplied tests](http://www.unicode.org/reports/tr41/tr41-15.html#Tests29) - added code to generate additionial categories in `unicode.py` - `Cn` aka `Not_Assigned` - categories necessary for grapheme cluster breaking - tidied up the exports from libunicode - all exports are exposed through a module rather than directly at crate root. - std::prelude imports UnicodeChar and UnicodeStrSlice from std::char and std::str rather than directly from libunicode closes #7043
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