use sitemap index compatible classes

This reenabled the default styling as used in older releases.

fixes #47

do not show hidden pages

fix filter option

fix: Handle empty parent case in isParent method

add the peek option

This replaces the handling of the sneakyindex mechanism by being more
clever.

revamp config options and tests

first go at rewrite using the TreeBuilder

code cleanup

avoid arrow function for php 7.2 compatibility

added home parameter

This wraps the entire tree under the start page of the selected
namespace.

abort early if no items found

added option to sort namespaces before other pages

Refactor item gathering and sorting

This fixes the broken sort by title mechanism

when using sneakyindex, check ACLs agains the namespace's start page

allow relative namespaces (starting with a dot)

new top level filter mechanism

Adding the option filter to the syntax adds a mechanism to filter the
list at the top level. The current filter is preserved through
navigation via session storage.

code cleanup

fix: check for unset variables to fix PHP Notices

While DokuWiki by default suppresses PHP Notices, they are still bad
style and we should not trigger them.

Update syntax.php

Stolen and slightly modified from unmerged pullrequest of "sinky"

Change from preg_replace to faster str_replace

Adjust the signature of handle and render

Fix position of subpages in ascii sorting

Since colons come in the ascii table after numbers, there was some
unintended sorting with multiple namespaces, which only differed by
unindented numbers at

Fix position of subpages in ascii sorting

Since colons come in the ascii table after numbers, there was some
unintended sorting with multiple namespaces, which only differed by
unindented numbers at the end. Replacing the colons with the '/' which
is in front of the numbers in the ascii table solved the problem.

Add a test for this.

Known possible issue: pages are not sorted after namespaces.

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Fix search function call

Add option for natural sorting and make it default

The search(...) function creates per default a natural sorted array.
This behaviour is now enforced by adding an explicit 'natural'
parameter. Sort

Add option for natural sorting and make it default

The search(...) function creates per default a natural sorted array.
This behaviour is now enforced by adding an explicit 'natural'
parameter. Sorting by the ascii table in now an option in the config
menu.

Add files for the configuration and add a test for the 'natural'
sorting.

However the ascii sorting is still broken and will be fixed in a later
commit. Currently the pages of an open namespace are not always below
the open namespace but below another one.

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safer string replacement in comparison