unicode/runenames: new package to look up rune names.

Fixes golang/go#17460

Change-Id: Iddf01924aaf5b54e3067f1ae7560ce5c2926772b
Reviewed-on: https://go-review.googlesource.com/32770
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
7 files changed