* nickvergessen/ticket/12099:
[ticket/12099] Fix correction in path_helper test
[ticket/12099] Prepend ./ to path to fix assets
[ticket/12099] Deduplicate path generation
[ticket/12099] Fix clean_path() ".." stripping when previous directory was "."
[ticket/12099] Break clean_path tests with a simple test
[ticket/12099] Clean paths in tests
[ticket/12099] Correctly fix go back to root before prepending the root path
[ticket/12099] Clean some paths before using them
[ticket/12099] Fix several issues in path_helper test
The symfony routing component allows us to use the path "/" for routes.
Therefore, we should be able to use example.com/app.php/ for controllers.
However, this currently does not properly work. The method get_web_root_path
incorrectly returns phpbb_root_path. Therefore, paths to images or files are
broken.
PHPBB3-12004
The redirect url currently uses the web root path. However as we prepend the
full board url later, we need to remove the relative web root path and prepend
the normal root path again. Otherwise redirects from inside routes will not
work as intended.
PHPBB3-11997
