[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/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/13280] Properly format the current page and add sanitizer to tests

PHPBB3-13280
[ticket/13280] Correctly format user page for build_url()

PHPBB3-13280
[ticket/13280] Add additional sanitizer for ampersands in server superglobal

PHPBB3-13280
[ticket/13100] Remove pointless variable

PHPBB3-13100
[ticket/13280] Seperate server sanitizer call and add comment

PHPBB3-13280
[ticket/13280] Only run sanitizer for server superglobal and modify tests

PHPBB3-13280
[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/13242] Fix HTML validity

PHPBB3-13242
[ticket/13265] Don't show link to edit own profile to those without permission

PHPBB3-13265
[ticket/13083] Fix language string NO_ENTRIES for logs

The string was misleading because there does not
always have to be a period when viewing log entries.

PHPBB3-13083