[ticket/13023] Add template event posting_editor_buttons_custom_tags_before

PHPBB3-13023
[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created, thus the check is no longer valid and ends up resetting the value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/13298] Add missing $db->freeresult(); calls in functions_admin.php

PHPBB3-13298
[ticket/13315] Check for the includes/captcha/plugins/ directory instead.

PHPBB3-13315
[ticket/13277] Force IE to not cache AJAX requests.

Caching causes problems, such as the inability to move a forum/CPF/module in the
same direction by more than one row.

PHPBB3-13277
Merge remote-tracking branch 'Nicofuma/ticket/13023' into develop-ascraeus

* Nicofuma/ticket/13023:
  [ticket/13023] Add template event posting_editor_buttons_custom_tags_before
Merge pull request #3152 from prototech/ticket/13277

[ticket/13277] Force IE to not cache AJAX requests.
Merge pull request #3151 from nickvergessen/ticket/13298

[ticket/13298] Add missing $db->freeresult(); calls in functions_admin.php
[ticket/13349] Fix breadcrumb arrow entity

PHPBB3-13349
Merge pull request #3154 from cyberalien/ticket/13349

[ticket/13349] Fix breadcrumb arrow entity
Merge pull request #3148 from prototech/ticket/13315

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

* prototech/ticket/13315:
  [ticket/13315] Check for the includes/captcha/plugins/ directory instead.
  [ticket/13315] Fix loss of CAPTCHA plugin config value.
Merge pull request #3149 from prototech/ticket/13342

[ticket/13342] Fix invalid resetting of CAPTCHA plugin when using Recaptcha

* prototech/ticket/13342:
  [ticket/13342] Fix invalid resetting of CAPTCHA plugin when using Recaptcha.