use time() for revision date of externally deleted page

also, code doc updates

rename saveRevisionInfo to cacheRevisionInfo

move hasRevision() to trait

fix fallback implementation for resolve_pageid()

When an empty link was given, the old implementation fell back to $ID,
this was handled incorrectly in the deprecated method.

simplify relative resolver and add tests

make resolveStartPage easier to understand

This dosn't really change the behaviour but makes the code easier to
grasp. A simple unit test has been added.

Update Ajax.php

linkwiz update

ChangeLogTrait

- move ChangeLog low level methods into trait
- static ChangeLog::parseLogLine() replaces parseChangeLogLine()
- new ChangeLog::buildLogLine()

translation update

new method ChangeLog::addLogEntry()

rewrite `detectExternalEdit()` in inc/common.php

change wrongly older mtime of current page than last revision

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()

UnitTest of pageinfo(), saveWikiText()

ChangeLog creates early .change file, p_get_metadata() will get full "meta_last_change" entry. The current key in the revinfo need to be excluded prior to p_s

UnitTest of pageinfo(), saveWikiText()

ChangeLog creates early .change file, p_get_metadata() will get full "meta_last_change" entry. The current key in the revinfo need to be excluded prior to p_set_metadata() call.

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coding style of functions using ChangeLog

fix wrong filesize of oldrev

new Changelog::saveRevisionInfo()

improve just created condition

case 1: new page or media
case 2: newer one that had existed but is already deleted via DW Editor

skip cached revInfo to keep "current" entry

to

remove DOKU_CHANGE_TYPE_EXTERNAL_DELETE