Twemoji graphics

Copyright Twitter, Inc. and other contributors.
Source: https://github.com/twitter/twemoji
Graphics license: Creative Commons Attribution 4.0 International (CC BY 4.0)
License text: https://creativecommons.org/licenses/by/4.0/legalcode

netCRM/netMail package the existing SVG and 72x72 PNG graphics without
artistic modification. Runtime scaling and ZIP packaging do not change the
source artwork.
