[ticket/11362] Correctly sanitise the directory path

We need to correctly remove ../ form the path if possible by removing the
previous folder aswell. Otherwise the finder is unable to locate /adm/style
directories in extensions as he is looking for /adm/../adm/style instead.

PHPBB3-11362
[ticket/11362] Add unit test for ../ in directory paths

PHPBB3-11362
[ticket/11485] add columns to styles table during updating schema before
updating the data

PHPBB3-10485
[ticket/11485] add revert_schema for the updated columns

PHPBB3-11485
[ticket/4412] Shorten long profile fields

Shorten long profile fields using CSS

PHPBB3-4412
[ticket/11275] Do not use document.write() for color palette

Replace document.write() for color palette function

PHPBB3-11275
[ticket/11275] Do not use spacer.gif in color picker

PHPBB3-11275
[ticket/10844] Add phpbb_root_path to phpbb_style_extension_path_provider

The phpbb_root_path needs to be removed from the style path, before giving
the path to the finder, because the finder prepends it later again and is
therefor unable to find style files when the root path is not ./

PHPBB3-10844
[ticket/10844] Make sure ext_path has no trailing slash

PHPBB3-10844
[ticket/10844] Add unit tests for different root_paths

PHPBB3-10844
[ticket/11362] Move phpbb_clean_path into a simple filesystem service

PHPBB3-11362
[ticket/11362] Use new filesystem class in finder

PHPBB3-11362
[ticket/11362] Replace other calls to phpbb_clean_path

Need to instantiate the object manually here, as the container is not yet
set up.

PHPBB3-11362
[ticket/11362] Extension manager depends on filesystem

PHPBB3-11362
[ticket/11362] Fix service description of finder

PHPBB3-11362
[ticket/11362] Add compatibility function phpbb_clean_path() again

The function first depends on the container, but also works without it and
without autoload. The reason for this is, it might be used before that
stuff is set up, like it has been in our common.php

PHPBB3-11362
[ticket/9975] Translate missing style error message

The error message about missing style data was not
translated

PHPBB3-9975
[ticket/10844] Add extension template file to locate

PHPBB3-10844
[ticket/10844] Increase prefix to not match template/ in finder test

PHPBB3-10844
[ticket/11362] Use container when available instead of creating a new instance

PHPBB3-11362