This allows React form builders (or other such view layer builders in a
headless environment) to obtain the details that would otherwise only be
rendered in a PHP side template. Some of the details are critical for
rendering correctly, and are necessary to be passed through -
particularly when moving toward replacing the Entwine initiator for
TinyMCE with a React component in `silverstripe/admin`.
I new interface method has been added to the abstract class for HTML
editor configs in order to facilitate this. It is not itself abstract as
this would break backwards compatiblity with any existing custom config
(aside from the TinyMCE one which we're editing here), which is most
certainly not what we want.
API Substitute Zend_Locale with Locale / NumberFormatter
API Substitute Zend_Date with IntlDateFormatter
API Added DBTIme::Nice12, FormatFromSettings
API Added Short() method to DBDate / DBTime / DBDatetime
API Add Date::getTimestamp()
API Added setSubmittedValue api for FormField
API Add second arg to base FormField::setValue()
API Major refactor of i18n into component data parts
API Implement Resettable interface to reset objects between tests
ENHANCEMENT Changed DBField::create_field return type to `static` to support better type hinting
ENHANCEMENT i18nTextCollector supports __CLASS__
