[!!!][TASK] Remove deprecated code from sysext core

This patch does not touch:
 * UpgradeWizard things => #62402
 * curl proxy options in DefaultConfiguration
 * BackendUserAuthentication disable_autocreate => #62415

Resolves: #62416
Releases: master
Change-Id: Id919431bb428f1e8922a6336f9a90a0b06b7a6a2
Reviewed-on: http://review.typo3.org/33484
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>