Update unicode.org URLs

Peter Eisentraut <peter@eisentraut.org>

Commit: bdb839cbdebe851c200b2c7c03aec7483573d631
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-10-13T20:10:38Z
Releases: 13.0
Update unicode.org URLs

Use https, consistent host name, remove references to ftp.  Also
update the URLs for CLDR, which has moved from Trac to GitHub.

Files

Documentation touched