package:intl - support list gender message selection

[DartBot]

This issue was originally filed by @seaneagan

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The intl package currently has Intl.gender to select messages based on gender. In addition when dealing with lists of people, languages have different rules to determine the gender. See:

CLDR:

http://unicode.org/reports/tr35/tr35-general.html#List_Gender

ICU:

http://icu-project.org/apiref/icu4j/com/ibm/icu/util/GenderInfo.html

Once issue #11069 is fixed, it may be nice to have a method to complement it, which can select a message based on list gender. This could either be added to Intl.gender by making the "gender" argument also accept an Iterable, or a new method such as Intl.listGender.

[DartBot]

This comment was originally written by @seaneagan

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This is probably low priority, but just wanted to make sure it is tracked.

[iposva-google]

Added Area-Pkg, Triaged labels.

[sethladd]

Added Pkg-Intl label.

[sethladd]

Removed Type-Defect, Priority-Unassigned labels.
Added Type-Enhancement, Priority-Low labels.

[DartBot]

This issue has been moved to dart-lang/i18n#335.