[ticket/13133] Allow @vendor_name for includecss

PHPBB3-13133
[ticket/13133] Add unit tests

PHPBB3-13133
[ticket/11863] Grey out unavailable activation methods when emails disabled

Further fall back to USER_ACTIVATION_DISABLE when emails are disabled
but evaluate it at runtime.

PHPBB3-11863
[ticket/11863] Display warning to user because of activation method

PHPBB3-11863
[ticket/11863] Add functional test

PHPBB3-11863
[ticket/13100] Display only confirmation buttons when deleting shadow topic

PHPBB3-13100
[ticket/13100] Remove pointless variable

PHPBB3-13100
[ticket/13133] Rename $ok variable

PHPBB3-13133
[ticket/13220] Add template events to memberlist_search.html

PHPBB3-13220
[ticket/13309] Add event acp_email_options_after

PHPBB3-13309
[ticket/13290] Add EVENT index_body_forumlist_body_after

PHPBB3-13290
[ticket/13326] add viewtopic_url to event

https://tracker.phpbb.com/browse/PHPBB3-13326

PHPBB3-13326
[ticket/13328] add core.mcp_view_forum_modify_sql

https://tracker.phpbb.com/browse/PHPBB3-13328

PHPBB3-13328
[ticket/13328] fix CS

https://tracker.phpbb.com/browse/PHPBB3-13328

PHPBB3-13328
[ticket/13326] fix CS

https://tracker.phpbb.com/browse/PHPBB3-13326

PHPBB3-13326
[ticket/13337] Allow empty array passed to sql_in_set()

is_array() will evaluate to true even if the array is just an empty array.
Make sure we also expect an empty array passed to sql_in_set().

PHPBB3-13337
[ticket/13342] Fix invalid resetting of CAPTCHA plugin when using Recaptcha.

The Recaptcha plugin class name does not follow the phpbb_captcha_ prefix
convention as all others. Instead it simply uses phpbb_, hence the check
for its existence under phpbb/captcha/plugins/ fails.

PHPBB3-13342
[ticket/13315] Fix loss of CAPTCHA plugin config value.

The plugins were moved to phpbb/captcha/plugins/ after this migration was
created, thus the check is no longer valid and ends up resetting the value
prematurely.

PHPBB3-13315
[ticket/13347] missing acp_forums template events

PHPBB3-13347
[ticket/13347] fix CS

PHPBB3-13347