This patch bundles a color font named "EmojiOne Mozilla", and turn on
the necessary code for including the bundled font, on Linux and Windows.
With that, users of Linux and Windows <=8.0 is able to see color Emoji
on Firefox without support from System.
The font bundled is the v0.2.1 version, generated from the project repo
in
https://github.com/mozilla/emojione-colr
with artwork from the original EmojiOne font and Twemoji,
under CC BY 4.0 license.
Test files, about:license page, and the packager instruction are
modified accordingly.
MozReview-Commit-ID: 2mmxnA0vS3u
Timothy Guan-tin Chien