rearranging the Index class structure

This is a first step at stuff at restructuring the indexing classes a
bit more.

Some background:

We have basically two different kind of index files:

a) RowI

rearranging the Index class structure

This is a first step at stuff at restructuring the indexing classes a
bit more.

Some background:

We have basically two different kind of index files:

a) RowIndex (like page.idx)

Each line in the index contains a single value. The line number is used
as primary ID. These files can be very large. Thus an index like that
should never be read into memory completely if it can be avoided.

b) TupleIndex (like i12.idx)

Each line contains a list of tuples. The files tend to be smaller so
loading them completely for search and replace is easier.

Since the the access is so completely different, I tried to model that
in the two different classes, basically moving the methods from
\dokuwiki\Search\AbstractIndex to the new classes.

While doing so, I tried to make the doc blocks, variable names and
interface easier to understand. I also added tests for each of the
methods.

The old code has not been touched yet. So these classes do not do
anything outside of tests currently.

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use Logger::debug() instead of deprecated dbglog()

catch up #3115 Sort with collator

added missing 'notns' related code

fix undefined array in FulltextSearch

this was already fixed by 5afd958 on 2021-02-05

fix undefined variable

add dbg_deprecated()

update metadata of changed page in PageFile class

fix typo

PHP8: check array key existence

remove page key from event data prior to return

$data['page'] is object $this, it is not possible to access the object after destructed.

fix Undefined variable $id

implement PageFile class

PageFile class handles wiki text file and its change management for specific page, main part comes from `function saveWikiText()`. This ensures and enables to use one **Pag

implement PageFile class

PageFile class handles wiki text file and its change management for specific page, main part comes from `function saveWikiText()`. This ensures and enables to use one **PageChangeLog** instance during a page save process among class methods and relevant plugins.

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remove goto-loop structure

plugin event handler should set correct changeType.

set current revision date 1sec before now for external deletion

in preparation for possible new page save

translation update

update saveWikiText()

allow plugin that provides alternative policy for handling external edits in changelog

rigorous COMMON_WIKIPAGE_SAVE

ignore wrong changes in id and file data caused by event handlers

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