unicode: update to Unicode 10.0.0

unicode: update to Unicode 10.0.0

Also includes all derived values as well as
vendored packages.

Generated by running
    UNICODE_VERSION=10.0.0 go generate
in golang.org/x/text

and modified by hand to add the tests and
entries in next.txt for new script and properties.

Closes Issue #21471

Change-Id: I1d10ee3887bd1fd3d5a756ee0d04bd6ec2814ba1
Reviewed-on: https://go-review.googlesource.com/63953
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>