* github-marc1706/ticket/12822:
[ticket/12822] Fix test runs of avatar manager_test
[ticket/12822] Add method for deleting avatars and use confirm_box
[ticket/12822] Remove "None" option from avatar select boxes
The method will take care of the actual deletion process in the avatar manager.
Additionally, we'll be using a confirm box while deleting the avatar to prevent
users from accidentally deleting their avatars.
PHPBB3-12822
* github-marc1706/ticket/11148:
[ticket/11148] Remove unneeded variable mimetype and use type octet-stream
[ticket/11148] Change expected output with disallowed content in test
[ticket/11148] Always use the output of the mimetype guesser in get_mimetype
[ticket/11148] Get rid of extra line in mimetype guesser setter doc block
[ticket/11148] Add missing parts to docblock of get_mimetype() method
[ticket/11148] Default to application/octet-stream if no mimetype given
[ticket/11148] Use mimetype guesser for uploaded avatars
[ticket/11148] Pass mimetype guesser to upload_attachment() function
[ticket/11148] Add mimetype guesser to filespec and fileupload class
This approach is cleaner and probably even faster the previous ways that
included using array_walk() or array_map() and other helper functions
and methods.
PHPBB3-11525
The service collection that was already passed to the avatar manager should
be used in the avatar manager method get_driver() instead of the container
itself.
PHPBB3-11857
Until now, the user data had both user_id and group_id keys in the avatar
data. As both group_ and user_ prefixes were removed the group_id was
collapsed onto the user_id and therefore all users in the same group had
the same prefix for their uploaded avatars. This patch will make sure
that the correct id is used depending on whether it's a group's or user's
avatar data.
PHPBB3-11525
Remove the $request property from the phpbb_avatar_driver class and rather
pass it as function argument if it's needed in a function. Currently this
is only the case for the class methods prepare_form() and process_form().
PHPBB3-10018
