[ticket/11984] Fix stray </ul> and active tab hover in ACP

PHPBB3-11984
[ticket/11984] Hide <dfn> for invalid extensions

PHPBB3-11984
[ticket/11984] Do not resize textarea on touch devices

PHPBB3-11984
[ticket/11979] Fix errors in dropdown

PHPBB3-11979
[ticket/11842] Add migration file for updating avatar type in database

PHPBB3-11842
[ticket/11842] Use only new avatar type in user_delete function

PHPBB3-11842
[ticket/12026] Correct path for template files

Correct path for template files in MCP and UCP modules, which are added
via extenstions

PHPBB3-12026
[ticket/12026] Remove phpbb root path

PHPBB3-12026
[ticket/11672] Move the reapply_sid() call before meta_refresh() is called.

The $redirect assignment is not necessary because the variable  has already been
set near the start of the functions. The redirect value will also never default
to index.php because a default value has already been provided when $redirect
is initially assigned and passed to the template as a hidden field.

PHPBB3-11672
[ticket/11484] Display login box for users following email notification link.

The link used for the latest post now uses view=unread so redirecting the user
using the value for the e parameter is no longer necessary.

PHPBB3-11484
[ticket/11959] Trim the list of users from post notifications.

PHPBB3-11959
Merge pull request #1881 from prototech/ticket/11484

[ticket/11484] Display login box for users following email notification link.
[ticket/11959] Use COMMA_SEPARATOR to join the user list.

PHPBB3-11959
[ticket/11959] Rename $extra_cnt to something more descriptive.

PHPBB3-11959
Merge pull request #1878 from blitze/ticket/12024

[ticket/12024] Template event overall_header_content_before
Merge pull request #1882 from prototech/ticket/11959

[ticket/11959] Trim the list of users from post notifications.
Merge pull request #1869 from prototech/ticket/10810

[ticket/10810] Move color swatches from popup windows to inline blocks.
Merge pull request #1834 from cyberalien/ticket/11984

Move responsive design adjustments
Merge pull request #1860 from prototech/ticket/12010

[ticket/12010] Make the navbar icons clickable.
Merge pull request #1856 from prototech/ticket/12001

[ticket/12001] Ensure that form data is sent to server in AJAX requests.