[ticket/13310] Always use sql_build_query in acp_email.php

PHPBB3-13310
[ticket/13297] Add unicode modifier to url/email regular expression patterns.

PHPBB3-13297
[ticket/13310] Add event core.acp_email_modify_sql

PHPBB3-13310
[ticket/13358] Add file_downloader as replacement for get_remote_file

PHPBB3-13358
[ticket/13358] Add file_downloader to version_helper

PHPBB3-13358
[ticket/13358] Use file_downloader in get_remote_file()

get_remote_file() has been marked as deprecated.

PHPBB3-13358
[ticket/13358] Fix tests and use exceptions instead of user object

PHPBB3-13358
[ticket/13354] Fix incorrect column name when deleting all topic logs.

PHPBB3-13354
[ticket/13358] Do not pass variables by reference

PHPBB3-13358
[ticket/13358] Use protected and public keywords where applicable

PHPBB3-13358
[ticket/13228] Fix codebox "select all" font-size in UCP and MCP

PHPBB3-13228
[ticket/12885] New if for Index-page - board-index-text switch

PHPBB3-12885
[ticket/10442] Adds <dd>&nbsp;</dd> to <dl> for xhtml correctness

PHPBB3-10442
[ticket/13228] Gotta use !important after all. Too bad

PHPBB3-13228
Merge branch 'develop-olympus' into develop-ascraeus
Merge branch 'develop-ascraeus' into develop
Merge pull request #3161 from Crizz0/ticket/12885

[ticket/12885] New if for Index-page - board-index-text switch
Merge branch 'develop-ascraeus' into develop
Merge pull request #3158 from prototech/ticket/13354

[ticket/13354] Fix incorrect column name when deleting all topic logs.
Merge branch 'develop-ascraeus' into develop