minor cleanup in AdminAction

removed unecessary method, added doc blocks

allow to instantiate Ui\MediaDiff('')

fix usage get_doku_pref()

var type of $oldRev and $newRev

remove last_rev property

bugfix in media Ui classes

bugfix page id "0" is valid

fix typo

abstract method itemFN()

fix phpdoc for deprecated functinos

check media id validity

fix variable declaration

rename variables

remove Ui\Diff::buildDiffHead()

refactor Diff with extendedRevisionInfo()

obsolete buildDiffHead()

translation update

define Ui\Revisions::getRevisions()

- new item property defined
- modified getObjRevInfo(), buildDiffHead()

translation update

allow instance when id is not identical with $INFO['id']

refactor buildDiffHead()

allow id is not identical with $INFO['id']

minor edits

use properties in showDiffViewSelector()

remove getDiffType()

new method setChangeLog()