emoji_aliases.txt removal
-------------------------
In the previous version, Google used the "family: man, woman, boy" emoji to 
represent the generic "family" emoji. In this version, Google created a unique 
emoji to represent the "family" emoji. The justification is that all 3 people 
in the new emoji are now represented as gender-neutral.

Emoji #408 is the family emoji. Emoji #409 is "family: man, woman, boy".
https://unicode.org/emoji/charts/full-emoji-list.html

Or compare https://emojipedia.org/family/ with 
https://emojipedia.org/family-man-woman-boy/
If you click Google, you can see the historical versions. This update is 
Android 9.0; the version currently in 18.04 LTS is Android 8.0.

The same thing happened with the "couple with heart" emoji, #404 and #405 where 
the 2 adults now are gender-neutral.
https://emojipedia.org/couple-with-heart/
https://emojipedia.org/couple-with-heart-woman-man/

So yes, this is a behavior change, but it is expected that there are
some changes to existing emoji. For a more dramatic example, see LP:
#1766736 (the pistol emoji change which landed in Ubuntu 18.04 LTS just
before release).

Not to mention the dramatic style change in Android 7.0. See
https://blog.emojipedia.org/rip-blobs-google-redesigns-emojis/

Small glyphs
------------
The small glyphs change was made in this commit:
https://github.com/googlei18n/noto-emoji/commit/e571d53e0299bd1

The commit message says that "android has legacy tooling that expects
small metrics" but they'll eventually switch to using big metrics. But
on closer reading, it does look like this used to build big metrics
before this change, so let me ask for clarification.

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https://bugs.launchpad.net/bugs/1788256

Title:
  Update fonts-noto-color-emoji to 20180810 release for Unicode 11

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