As a backport Extbase is influenced by all the changes in FLOW. It's
important to keep both in sync and thus deprecate code which is not
in FLOW3 anymore or which has changed.

All deprecated annotations should now match the CGL and all removals
are terminated in the future.

* clean up deprecation annotation
* remove code which was deprecated long enough

Change-Id: Ic1b6217bc6c9100b6c48c5d30eca6068417265a8