Repairing tests and regressions
Consistently use `Security::getCurrentUser()` and `Security::setCurrentUser()`
Fix for the logout handler to properly logout, some minor wording updates
Remove the login hashes for the member when logging out.
BasicAuth to use `HTTPRequest`
API Remove Director::$test_servers / $dev_servers
API Remove MODULES_PATH / MODULES_DIR constants
ENHANCEMENT Injector backtick syntax now supports environment variables as well as constants
Fixes#6588
API Add HasRequestHandler interface
API Refactor Link() and url handling behaviour from Controller into RequestHandler
API RequestHandler classes now must define url_segment to have a default Link()
API Clean up redirectBack()
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__
* API Replace existing Email and Mailer classes with SwiftMailer powered email system
* DOCS New Email docs
* Initial feedback from Damian
* Making Mailer an interface
* Templates relocated
* Round of feedback
* More robust approach to plain parts
* Revert changes to TestMailer
