[ticket/11494] Fix memberlist leaders functional tests

The scope of the crawler should be reduced to the specific table

PHPBB3-11494
[ticket/11491] Move file to correct directory

PHPBB3-11491
[ticket/11491] Fix class name of functional test

PHPBB3-11491
[ticket/11491] Add extension_acp_test.php to functional group

PHPBB3-11491
[ticket/11491] Fix path to the ext/ folder

PHPBB3-11491
[ticket/11491] Correctly remove the store/temp_ext/ directory after use

PHPBB3-11491
[ticket/11491] Only copy files from phpBB/ext/ the directory exists

PHPBB3-11491
[ticket/11491] Copy files back only if we saved them previously

PHPBB3-11491
[ticket/11494] Use functions instead of repeating

PHPBB3-11494
[ticket/11494] Filter crawler in first place

PHPBB3-11494
Merge remote-tracking branch 'nickvergessen/ticket/11494' into develop

* nickvergessen/ticket/11494:
  [ticket/11494] Filter crawler in first place
  [ticket/11494] Use functions instead of repeating
  [ticket/11494] Fix memberlist leaders functional tests
[ticket/11488] Use correct base class in email notification method

In ticket/11451 this was not correctly changed to reflect the new class
phpbb_notifcation_method_messenger_base. Additionally, an undefined
variable error has been fixed in messenger_base.php (change should be
confirmed by bantu though).

PHPBB3-11488
[ticket/11493] add check for phpBB Debug in functional tests

PHPBB3-11493
[ticket/11493] add checks for Notice and Warning

PHPBB3-11493
Merge remote-tracking branch 'marc1706/ticket/11488' into develop

* marc1706/ticket/11488:
  [ticket/11488] Use correct base class in email notification method
Merge remote-tracking branch 'dhruvgoel92/ticket/11493' into develop-olympus

* dhruvgoel92/ticket/11493:
  [ticket/11493] add checks for Notice and Warning
  [ticket/11493] add check for phpBB Debug in functional tests
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11493] add checks for Notice and Warning
  [ticket/11493] add check for phpBB Debug in functional tests
Merge remote-tracking branch 'nickvergessen/ticket/11491' into develop

* nickvergessen/ticket/11491:
  [ticket/11491] Copy files back only if we saved them previously
  [ticket/11491] Only copy files from phpBB/ext/ the directory exists
  [ticket/11491] Correctly remove the store/temp_ext/ directory after use
  [ticket/11491] Fix path to the ext/ folder
  [ticket/11491] Add extension_acp_test.php to functional group
  [ticket/11491] Fix class name of functional test
  [ticket/11491] Move file to correct directory
[ticket/10966] Introduce MySQL base class

PHPBB3-10966
Merge remote-tracking branch 'nickvergessen/ticket/10966' into develop

* nickvergessen/ticket/10966:
  [ticket/10966] Introduce MySQL base class