remove DOKU_CHANGE_TYPE_EXTERNAL_DELETE

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.

create ChangeLog::getCurrentRevisionInfo()

assign tentative revision for possible external edition, as $lastRev +1

Revert "disable external edit check to avoid unittest fails"

This reverts commit 162709daa8557d651e7afd7a6aa3e62f08bf0ade.

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

disable external edit check to avoid unittest fails

Remove phpunit cache.

use getFilename() method instead of wikiFN()

fix Non-obvious Ternary Operators

Fix PHPUnit fatal errors compatibility with void.

Method names with leading double underscore are reserved by PHP.

fix named access to the sha hashing mechanisms

adjust help text of extension cli

to reflect that extensions can be installed from URLs as well

move IXR XML RPC to composer dependency #1970

This is a monky patched version of kissyfrot/php-ixr until my PR has
been accepted upstream.

Plugins using the XML RPC client may need adjustments.

external edits in changelog for images

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

add external edits to revision listings

- general function for retrieving external edit changelogline
- changelogline is cached after use of the function, then also retrievable by getRevisionInfo()

add external edits to revision listings

- general function for retrieving external edit changelogline
- changelogline is cached after use of the function, then also retrievable by getRevisionInfo()
- included in retrieveRevisionsAround() as well

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translation update