[ticket/13197] Also delete group avatar from users that have it set

PHPBB3-13197
[ticket/13197] Test that user's group avatar is deleted by group avatar delete

PHPBB3-13197
[ticket/13204] Tell user that password was incorrect when exceeding attempts

At the end of the login method, the captcha was entered correctly and only
the password was incorrect. Therefore, just tell the user that the password
was incorrect. He will see that he still needs to enter a captcha.

PHPBB3-13204
[ticket/13284] Fix request name so users can cc themselves

PHPBB3-13284
[ticket/13284] Set message body in topic form too, so it will be sent

PHPBB3-13284
[ticket/13197] Correctly format sql query

PHPBB3-13197
[ticket/13197] Fix tabbing

PHPBB3-13197
[ticket/13323] empty auth option in posting.php

https://tracker.phpbb.com/browse/PHPBB3-13323

PHPBB3-13323
[ticket/13316] Ensure Recaptcha image uses https when necessary.

PHPBB3-13316
Merge pull request #3156 from prototech/ticket/13316

[ticket/13316] Ensure Recaptcha image uses https when necessary.
Merge pull request #3064 from marc1706/ticket/13197

[ticket/13197] Also delete group avatar from users that have it set
Merge pull request #3068 from marc1706/ticket/13204

[ticket/13204] Tell user that password was incorrect when exceeding attempts
Merge pull request #3108 from Elsensee/ticket/13284

[ticket/13284] Message body not included in email
Merge pull request #3127 from omniError/ticket/13323

[ticket/13323] empty auth option in posting.php
[ticket/10744] Prevent installing styles with reserved names

PHPBB3-10744
[ticket/10744] Type hint objects for IDE usages

PHPBB3-10744
[ticket/10744] Fix some doc blocks

PHPBB3-10744
Merge pull request #3094 from nickvergessen/ticket/10744

Ticket/10744 Prevent installing styles with reserved names