Note this does not change image files.
- modify emoji_builder so we can use a flag to control whether to use
big or small glyph metrics. android has legacy tooling that expects
small metrics. we leave the default in emoji_builder to use big metrics
but in the makefile default the flag we pass to request small metrics.
eventually this should shake out to big metrics.
- support more flags by default (not all yet). Note we omit some in the
Makefile that we use aliases for-- we don't need their images.
- add aliases for some new flags
- remove new flags from 'unknown flag aliases' list
- unalias some emoji we will have custom images for
- bump version number
- add annnotations file for u11 new and changed emoji
Thumbnail generation for Unicode requires some changes:
- 72x72 images (exact, not just fit within that frame)
- custom prefix ending in underscore
- images for unsupported flags
The default build doesn't support some flags by default, since they
are not wanted by Android. For the thumbnail list these images need
to be provided, so we alias them to the unknown flag images as that's
what would show for them. It's probably a good idea to list these
explicitly anyway, other tools could use this information.