[ticket/12704] Improve the load time information in the footer when enabled

PR #2570 has added new constant to display load time information without
debug mode is being on (https://tracker.phpbb.com/browse/PHPBB3-12687).
This patch expands the total load time info with SQL/PHP load times,
while hiding the additional info with <abbr> element.

PHPBB3-12704
[ticket/12691] Add core.delete_pm to funtion delete_pm

Add core.delete_pm to funtion delete_pm.
Event will return:
int $user_id - ID of the user requested the message delete
array $msg_ids - array of all messages to be deleted
int $folder_id - ID of the user folder where the messages are stored
Justification:
Allow extensions to capture this event
and act as intended by ext author

PHPBB3-12691
[ticket/12691] Change event to core.delete_pm_before

Just a requested change by nickvergessen

PHPBB3-12691
[ticket/12691] Comment change

Change a bit the core event comment

PHPBB3-12691
[ticket/12701] Add events to user_add function

Add two new events to user_add function
in ./includes/functions_user.php.

core.user_add_before - allow modification of
submitted to function data.
Returns:
@var array $user_row - user_row array - User array
@var array $cp_data - cp_data array - CPF array

core.user_add_after - return user_id, user_row and
cp_data after user registration
Returns:
@var int $user_id - user_id of the new user
@var array $user_row - user_row array - User array
@var array $cp_data - cp_data array - CPF array

Justification:
Allow extensions to parse data before and after
creation of the user.

PHPBB3-12701
[ticket/12701] Rmove before event and expand modify_data

Removing core.user_add_before
Adding $user_row and $cp_data to core.user_add_modify_data

PHPBB3-12701
[ticket/12701] Add change

Change back to since
Add change

PHPBB3-12701
[ticket/12714] Move "allow all forums" in its own dd-element

PHPBB3-12714
Merge pull request #2586 from lucifer4o/ticket/12701

[Ticket/12701] Add events to user_add function

* lucifer4o/ticket/12701:
  [ticket/12701] Add change
  [ticket/12701] Rmove before event and expand modify_data
  [ticket/12701] Add events to user_add function
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12701] Add change
  [ticket/12701] Rmove before event and expand modify_data
  [ticket/12701] Add events to user_add function
Merge pull request #2575 from lucifer4o/ticket/12691

[ticket/12691] Add core.delete_pm to funtion delete_pm

* lucifer4o/ticket/12691:
  [ticket/12691] Comment change
  [ticket/12691] Change event to core.delete_pm_before
  [ticket/12691] Add core.delete_pm to funtion delete_pm
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12691] Comment change
  [ticket/12691] Change event to core.delete_pm_before
  [ticket/12691] Add core.delete_pm to funtion delete_pm
Merge pull request #2597 from Skouat/ticket/12714

[ticket/12714] Switching the description of radio buttons to align the correct description above the listbox

* Skouat/ticket/12714:
  [ticket/12714] Move "allow all forums" in its own dd-element
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12714] Move "allow all forums" in its own dd-element
Merge pull request #2591 from rxu/ticket/12704

[ticket/12704] Improve the load time information in the footer when enabled

* rxu/ticket/12704:
  [ticket/12704] Improve the load time information in the footer when enabled
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12704] Improve the load time information in the footer when enabled