TYPO3 Core

To ease the update pain a compatibility layer for AbstractUpdate based
upgrade wizards will be implemented, that allows running "old" wizards
on CLI (enabling extension authors to support both v8 and v9 with one
wizard).

To get people to migrate to the new structure the methods in Abstract
Update will all be marked as deprecated. As it is an abstract class this has
to be done in all methods and the constructor as we cannot reliably know
which methods are overwritten.