[ticket/11400] If email is disabled, disable it for notifications

PHPBB3-11400
[ticket/11402] Fix undefined index in post/topic_in_queue

PHPBB3-11402
Merge remote-tracking branch 'EXreaction/ticket/11402' into develop

# By Nathan Guse
# Via Nathan Guse
* EXreaction/ticket/11402:
  [ticket/11402] Fix undefined index in post/topic_in_queue
Merge remote-tracking branch 'EXreaction/ticket/11400' into develop

# By Nathan Guse
# Via Nathan Guse
* EXreaction/ticket/11400:
  [ticket/11400] If email is disabled, disable it for notifications
[ticket/10202] Implementation of config options with arbitrary length values.

PHPBB3-10202
[ticket/10202] Add database schema for phpbb_config_db_text.

PHPBB3-10202
[ticket/10202] Adjust method names to guidelines.

PHPBB3-10202
[ticket/10202] Add tests for phpbb_config_db_text.

PHPBB3-10202
[ticket/10202] Define phpbb_config_db_text as a service.

PHPBB3-10202
[ticket/10202] Add $this->db->sql_freeresult($result) to SELECT queries.

PHPBB3-10202
[ticket/10202] SQL escape the table name.

PHPBB3-10202
[ticket/10202] Improve method documentation.

PHPBB3-10202
[ticket/10202] Upgrade TEXT to the bigger MTEXT.

PHPBB3-10202
[ticket/10202] Add migration file for config_db_text.

PHPBB3-10202