[ticket/11881] Timezone migration can take a long time

PHPBB3-11881
[ticket/11881] Better split the timezone conversion into chunks; add test

PHPBB3-11881
[ticket/11881] Make sure user_timezone isn't converted twice

PHPBB3-11881
[ticket/11881] Limit to 500

PHPBB3-11881
[ticket/11881] Fix test filename

PHPBB3-11881
[ticket/12382] Add template test for subloops inside events

PHPBB3-12382
[ticket/12389] Move print topic & email topic icons to topic tools

PHPBB3-12389
[ticket/12389] Change language of email friend

PHPBB3-12389
[ticket/12382] Add template test for subloops inside includes

PHPBB3-12382
[ticket/11917] Hide OAuth UCP Module when OAuth is not the selected backend

PHPBB3-11917
[ticket/11917] Move OAuth Module to the bottom while installing

PHPBB3-11917
[ticket/12382] Mark broken nested loop with include as incomplete

PHPBB3-12382
[ticket/8960] Allow changing avatar path if it's not writable

This change will allow users to change the avatar path even if it's not
writable. However, this will get rid of the error message that the path is
not writable. Due to this, a minor addition to the explain message in the ACP
settings has been made.

PHPBB3-8960
[ticket/12201] Separate pagination from table.

PHPBB3-12201
[ticket/12201] Center the file size and mark columns.

PHPBB3-12201
[ticket/12201] Rearrange pagination, sorting, and submit elements.

PHPBB3-12201
[ticket/12201] Only the top pagination should be floated to the right.

PHPBB3-12201
[ticket/12201] Display error and sorting options when there are no attachments

PHPBB3-12201
[ticket/12201] Fix typos in language pack.

PHPBB3-12201
[ticket/12201] Add link to resync file stats after error.

PHPBB3-12201