[ticket/12448] Allow null as default value for columns

PHPBB3-12448
[ticket/12448] Fix null columns for postgres

PHPBB3-12448
[ticket/12448] Fix null columns for MS SQL

PHPBB3-12448
[ticket/12791] String profile fields do not use links ...

smilies and line breaks in memberlist

The value is overwritten with the contact value
Added aditional check if the field is a contact so we don't overwrite it.

PHPBB3-12791
[ticket/12791] Changed the if check

Removed unneeded variable

PHPBB3-12791
[ticket/12793] String '0' does not display for string profile fields

See https://github.com/phpbb/phpbb/pull/2647#discussion_r14503051

PHPBB3-12793
[ticket/12793] Changing get_profile_contact_value to get_profile_value_raw

Changing the return to get_profile_value_raw

PHPBB3-12793
[ticket/12793] Tests (added and changed)

changed behavieur of 0 as in and added 0 as string test

PHPBB3-12793
[ticket/12861] Add event to modify the post, poster and attachment data

PHPBB3-12861
[ticket/12857] Add template events breadcrumbs_before/after

PHPBB3-12857
[ticket/12857] Add missing template events breadcrumb_prepend

To insert links after site-home

PHPBB3-12857
[ticket/12656] Pass user object into all console commands.

PHPBB3-12656
[ticket/12871] Add PHPBB_DISPLAY_LOAD_TIME const to config.php on installation

To make it consistent with another config.php constants,
PHPBB_DISPLAY_LOAD_TIME is to be put in config.php during installation as well.

PHPBB3-12871
[ticket/12560] Add methods to set upload and temp paths in plupload

The paths will be reset to the default paths after an upload is complete.

PHPBB3-12560
[ticket/12883] Do not use basename() to get the search class in tidy_search

PHPBB3-12883
Merge pull request #2651 from nickvergessen/ticket/12448

[ticket/12448] Allow null as default value for columns
Merge pull request #2752 from bantu/ticket/12656

[ticket/12656] Pass user object into all console commands for translation
Merge pull request #2745 from nickvergessen/ticket/12861

[ticket/12861] Add event to modify the post, poster and attachment data

* nickvergessen/ticket/12861:
  [ticket/12861] Add event to modify the post, poster and attachment data
[ticket/12851] Fix the Font colour button title

PHPBB3-12851
Merge pull request #2757 from rxu/ticket/12871

[ticket/12871] Add PHPBB_DISPLAY_LOAD_TIME const to config.php on installation

* rxu/ticket/12871:
  [ticket/12871] Add PHPBB_DISPLAY_LOAD_TIME const to config.php on installation