List field predefined options

Supports 'predefined options' for core list fields such as US states, etc. Provides a plugin to allow other modules to define their own lists.

This is similar in functionality to the Webform-specific hook hook_webform_select_options_info, but is intended for an API for not just core but for other modules as well.

Predefined lists provided by the module

• US states
• Timezones
• Have a good idea for a list to add? File a feature request for it!