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