[ticket/12325] Automatic update should notify about outdated files

PHPBB3-12325
[ticket/12325] Fix: it's not stuck in an inifinite loop anymore

PHPBB3-12325
[ticket/12325] Don't use L_COLON

PHPBB3-12325
[ticket/12325] Fix: add a missing colon

PHPBB3-12325
[ticket/12325] Update coding style in template

PHPBB3-12325
[ticket/12099] Fix several issues in path_helper test

PHPBB3-12099
[ticket/12099] Clean some paths before using them

PHPBB3-12099
[ticket/12099] Correctly fix go back to root before prepending the root path

This allows moving app.php outside of phpBB and still work as expected

PHPBB3-12099
[ticket/12099] Clean paths in tests

PHPBB3-12099
[ticket/12099] Break clean_path tests with a simple test

PHPBB3-12099
[ticket/12099] Fix clean_path() ".." stripping when previous directory was "."

PHPBB3-12099
[ticket/12325] Fix the language var name

PHPBB3-12325
[ticket/12099] Deduplicate path generation

PHPBB3-12099
[ticket/12099] Prepend ./ to path to fix assets

PHPBB3-12099
[ticket/12099] Fix correction in path_helper test

PHPBB3-12099
[ticket/12716] Add the missing parameters in the call of clearToken

PHPBB3-12716
[ticket/12716] Add regression test

PHPBB3-12716
[ticket/12716] Use a string as session_id

PHPBB3-12716
[ticket/12196] Fix typo "referer" in acp/attachments

PHPBB3-12196
[ticket/12771] Bug in profilefield_base_migration when used in ext

The base migration class should create lang entry for the new CPF
but it is supposed to strip it of phpbb_ prefix. As extensions
CPFs do not use phpbb_ prefix it will not create a lang entry.
This is as simple solution as it can be done.

PHPBB3-12771