[ticket/12351] Add loading indicator to links that are missing it.

When you click on the link, the turning circle is missing, so you don't
know whether it is actually doing something or not, until the response is
served.

PHPBB3-12351
[ticket/12211] Do not run attachment file names twice through htmlspecialchars

Upload filenames are already processed via htmlspecialchars in the
type_cast_helper of the new request class. There is no need to run it through
htmlspecialchars() again in the filespec class.

PHPBB3-12211
Merge remote-tracking branch 'VarunAgw/ticket/12351' into develop-ascraeus

* VarunAgw/ticket/12351:
  [ticket/12351] Add loading indicator to links that are missing it.
Merge remote-tracking branch 'marc/ticket/12211' into develop-ascraeus

* marc/ticket/12211:
  [ticket/12211] Do not run attachment file names twice through htmlspecialchars
[ticket/12395] Check for posts in the middle of the page

PHPBB3-12395
Merge remote-tracking branch 'nickvergessen/ticket/12395' into develop-ascraeus

* nickvergessen/ticket/12395:
  [ticket/12395] Check for posts in the middle of the page
[ticket/12265] Simplify contact icon design and move to dropdown.

PHPBB3-12265
[ticket/12265] Remove ugly logic.

PHPBB3-12265
[ticket/12265] Fix issue with dropdown being restricted by the width of parent

PHPBB3-12265
[ticket/12265] Add contact icon and remove border from last row & cells.

PHPBB3-12265
[ticket/12265] Ensure that there's only 4 icons per row in IE & Opera.

PHPBB3-12265
[ticket/12265] Adjust alignment of AIM and Jabber icons.

PHPBB3-12265
[ticket/12265] Fix modulo logic.

PHPBB3-12265