[ticket/11935] Fix <p> tags not allowed inside <strong> tags

PHPBB3-11935
[ticket/11935] Fix incorrect alt tags that should be title tags

PHPBB3-11935
[ticket/11935] Fix stray </a> tags

PHPBB3-11935
[ticket/11935] Fix invalid HTML usage of <label> tag in prosilver

PHPBB3-11935
[ticket/11935] Remove obsolete table attributes from Prosilver

cellpadding, cellspacing, border are obsolete table attributes.
They are handled by CSS already using table and .table1

PHPBB3-11935
[ticket/11935] Replace obsolete table attributes in Admin with CSS

PHPBB3-11935
[ticket/11935] Tweak colour swatch table

PHPBB3-11935
Merge branch 'develop' into ticket/11935
[ticket/11914] Use unix line endings in plupload queue css file

PHPBB3-11914
[ticket/11914] Update plupload to 2.0.0

There are no longer seperate javascript files for each type of uploader.
New filenames have been kept as used inside the plupload package.

PHPBB3-11914
[ticket/11525] Only remove group or user prefix from given avatar data

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
[ticket/11534] Check remote avatar content type if possible

This should make sure that error pages like 404 or 503 pages are not treated
as remote avatar images.

PHPBB3-11534
[ticket/11935] Merge remote-tracking branch 'upstream/develop'

PHPBB3-11935
[ticket/11975] Add ACP link next to MCP link in header

PHPBB3-11975
[ticket/11975] Make link text shorter on smaller resolutions

PHPBB3-11975
[ticket/11975] Change shortened ACP/MCP label to Administer/Moderate

Also utilizing the new data-responsive-text attribute

PHPBB3-11975
[ticket/11975] Remove copy/paste fail, fix tests

PHPBB3-11975
[ticket/11998] Add symfony/console as dependency.

PHPBB3-11998
[ticket/11998] Basic console application script.

PHPBB3-11998
[ticket/11998] Use container to get all commands using 'console.command' tag.

PHPBB3-11998