[ticket/12300] Revert topic title links back to default behavior

PHPBB3-12300
[ticket/12300] Make topic icon links clickable to newest unread posts

PHPBB3-12300
[ticket/12300] Rename new class for row icon links

PHPBB3-12300
[ticket/12300] Make all topic row icons clickable

Forum list icons link to first page of forum
UCP subscribed forums icons link to first page of forum
MCP Forum page topic icons link to first (or first unread) post
PM Icons link to the message

PHPBB3-12300
[ticket/12300] Fix alignment of clickable icons

PHPBB3-12300
[ticket/12300] Fix broken link to last post in topic subscriptions list

PHPBB3-12300
[ticket/12300] Make only red topic/forum row icons clickable to unread posts

PHPBB3-12300
Merge remote-tracking branch 'vsephpbb/ticket/12300' into develop-ascraeus

* vsephpbb/ticket/12300:
  [ticket/12300] Make only red topic/forum row icons clickable to unread posts
  [ticket/12300] Fix broken link to last post in topic subscriptions list
  [ticket/12300] Fix alignment of clickable icons
  [ticket/12300] Make all topic row icons clickable
  [ticket/12300] Rename new class for row icon links
  [ticket/12300] Make topic icon links clickable to newest unread posts
  [ticket/12300] Revert topic title links back to default behavior