[ticket/12099] Add request argument to path_helper service

PHPBB3-12099
[ticket/12099] Correctly fix the path when performing AJAX requests

If the current request is a AJAX we need to fix the paths.
We need to get the root path based on the Referer, so we can use
the generated URLs in the template of the Referer. If we do not
generate the relative path based on the Referer, but based on the
currently requested URL, the generated URLs will not point to the
intended locations:
	Referer				desired URL			desired relative root path
	memberlist.php		faq.php				./
	memberlist.php		app.php/foo/bar		./
	app.php/foo			memberlist.php		../
	app.php/foo			app.php/fox			../
	app.php/foo/bar		memberlist.php		../../
	../page.php			memberlist.php		./phpBB/
	../sub/page.php		memberlist.php		./../phpBB/

PHPBB3-12099
[ticket/12099] Remove config again

PHPBB3-12099
[ticket/12099] Add unit tests for get_web_root_path_from_ajax_referer()

PHPBB3-12099
[ticket/12787] Use a parameter (_referer) instead of the Referer header

PHPBB3-12787
[ticket/12787] Fix the absolute board url

PHPBB3-12787
[ticket/12802] Properly handle connection failures in SQLite3

PHPBB3-12802
[ticket/12812] Add a migrator tool for config_text database changes

PHPBB3-12812
[ticket/12787] Remove one app.php when it's both in $path and $web_root_path

PHPBB3-12787
[ticket/12812] Improve migrator config_text tool tests

PHPBB3-12812
[ticket/12812] Improve migrator config_text tool tests

PHPBB3-12812
[ticket/12804] Hide Jabber from UCP & member search when disabled

PHPBB3-12804
[ticket/12804] Hide jabber for subSilver2 as well

PHPBB3-12804
[ticket/12804] Dont use ternary form

PHPBB3-12804
[ticket/12812] Remove unused global $db from tests

PHPBB3-12812
Merge pull request #2690 from Noxwizard/ticket/12802

[ticket/12802] Properly handle connection failures in SQLite3

* Noxwizard/ticket/12802:
  [ticket/12802] Properly handle connection failures in SQLite3
[ticket/12787] Add controller_helper::get_current_url()

PHPBB3-12787
[ticket/12787] Updates phpbb_mock_controller_helper

PHPBB3-12787
[ticket/12804] Disable jabber from memberlist sort options

PHPBB3-12804
Merge pull request #2695 from VSEphpbb/ticket/12812

[ticket/12812] Add a migrator tool for config_text database changes

* VSEphpbb/ticket/12812:
  [ticket/12812] Remove unused global $db from tests
  [ticket/12812] Improve migrator config_text tool tests
  [ticket/12812] Improve migrator config_text tool tests
  [ticket/12812] Add a migrator tool for config_text database changes