Recent Changes page can also show external edits

import classes, replace dbglog, simplify, remove unused statements, and other warnings from IntelliJ

update phpdocs,
rename dokuwiki/Ui/Draft to PageDraft

remove Diff::buildDiffHead

new in development version, is not used.

use false for unknown timestamp instead of 'unknown'

typo

get revision pair in Diff:handle()

set revInfo['current'] in Ui\Recents

set revInfo{'current'] when needed

do not set 'current' key in ChangeLog:getCurrentRevisionInfo(), instead set it during loop in Revision and Diff classes

obsolete ChangeLog:isExternalEdition

new methods: isLastRevision(), lastRevision()

skip cached revInfo to keep "current" entry

to

set ChangeLog property currentRevision when instantiated

will cause more unittest errors during common_pageinfo_test

Modernize Ui\Diff, PageDiff, MediaDiff

- define class property RevInfo pair
- handle() html form data
- preProcess() set RevInfo pair
- show() generate html
- set RevInfo in CompareWith() when confl

Modernize Ui\Diff, PageDiff, MediaDiff

- define class property RevInfo pair
- handle() html form data
- preProcess() set RevInfo pair
- show() generate html
- set RevInfo in CompareWith() when conflict and draft

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obsolete Diff::getExtendedRevisionInfo()

use integer $rev in Revision and Diff forms

pass tentative revision instead of 'current' for external edition

@ssahara update Ui\Diff using ChangeLog\getCurrentRevisionInfo()

remove class property $item
remove abstract function itemFN()
ignore metadata when considering external edit

update Ui\Revisions using ChangeLog\getCurrentRevisionInfo()

remove class property $item
remove abstract function itemFN()
simplify function getRevisions($first, $hasNext)

check externally deleted items in do=recent

do not update revision info for externally modified items to avoid wrong sort order in the recent list.

WIP: handle External Deletion using time() for dummy rev number

fix Non-obvious Ternary Operators

external edits at diff page

- removed pages used content of last existing version in a diff, this makes diff inconsistent. Now manually set to empty string if doing diff.
- dummy entry for newer pag

external edits at diff page

- removed pages used content of last existing version in a diff, this makes diff inconsistent. Now manually set to empty string if doing diff.
- dummy entry for newer page has probably no use, as the external edits/deletions are recognized now
TODO unknown scenario not yet tested

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list external edits also in revs list

- current revision changelogline is already in changelog, so retrieve in one go
- include listing of external edits
- for external deletions no date is known

remove MEDIA_DIFF event handling

MEDIA_DIFF event is not documented in devel:events_list and not used in any plugins.

Fix undefined array keys when displaying revisions

Fix Undefined array keys in Diff.php

Occurs when the selected revision is the first or last of the list,
for both the left and right revs.

Fix Undefined array key "current" warnings

Multiple occurrences when showing a page's revisions.

Fixes #3392