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

PHPBB3-12883
[ticket/12884] Add core event to the function upload_attachment()

Add core event to the function upload_attachment()
in functions_posting.php to provide ability for extensions
to perform additional actions on uploaded files, like resizing etc.

PHPBB3-12884
[ticket/12883] Remove pointless comments

PHPBB3-12883
[ticket/12881] Checks earlier if server-side topic marking is enabled

PHPBB3-12881
Merge pull request #2777 from Nicofuma/ticket/12881

[ticket/12881] Debug error - Undefined index: mark_time

* Nicofuma/ticket/12881:
  [ticket/12881] Checks earlier if server-side topic marking is enabled
Merge pull request #2768 from Nicofuma/ticket/12883

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

* Nicofuma/ticket/12883:
  [ticket/12883] Remove pointless comments
  [ticket/12883] Do not use basename() to get the search class in tidy_search
[ticket/12896] Add php event for admin notices

PHPBB3-12896
Merge branch 'ticket/forumhulp/12896' into develop-ascraeus

* ticket/forumhulp/12896:
  [ticket/12896] Add php event for admin notices
Merge pull request #2769 from rxu/ticket/12884

[ticket/12884] Add core event to the function upload_attachment()

* rxu/ticket/12884:
  [ticket/12884] Add core event to the function upload_attachment()
[ticket/12843] Fix Mark forums read browser console error

When you click on "Mark forums read" in the browser console error occurs
ReferenceError: assignment to undeclared variable phpbbAlertTimer
ajax.js (line13)

PHPBB3-12843
Merge branch 'ticket/sumanai/12843' into develop-ascraeus

* ticket/sumanai/12843:
  [ticket/12843] Fix Mark forums read browser console error
Merge pull request #2719 from lucifer4o/ticket/12791

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

* lucifer4o/ticket/12791:
  [ticket/12791] Changed the if check
  [ticket/12791] String profile fields do not use links ...
Merge pull request #2718 from lucifer4o/ticket/12793

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

* lucifer4o/ticket/12793:
  [ticket/12793] Tests (added and changed)
  [ticket/12793] Changing get_profile_contact_value to get_profile_value_raw
  [ticket/12793] String '0' does not display for string profile fields