[ticket/12832] Make .small-icon styling uniform

PHPBB3-12832
[ticket/12832] Add footer links to quick-links

PHPBB3-12832
[ticket/12832] Remove unnecessary attr and classes

PHPBB3-12832
[ticket/12832] Remove old .quick-links icon reference

PHPBB3-12832
Merge remote-tracking branch 'PayBas/ticket/12832' into develop-ascraeus

* PayBas/ticket/12832:
  [ticket/12832] Remove old .quick-links icon reference
  [ticket/12832] Remove unnecessary attr and classes
  [ticket/12832] Add footer links to quick-links
  [ticket/12832] Make .small-icon styling uniform
Merge pull request #2812 from bantu/ticket/12826

[ticket/12826] Add root namespace indicator to exception catching.

* bantu/ticket/12826:
  [ticket/12826] Add optional root namespace indicator for consistency.
  [ticket/12826] Add mandatory root namespace indicator to exception catching.